Quarterly report pursuant to Section 13 or 15(d)

LIABILITIES AND LONG-TERM DEBT (Details)

LIABILITIES AND LONG-TERM DEBT (Details) - USD ($) $ in Thousands		3 Months Ended
	Oct. 01, 2014	Mar. 31, 2018	Dec. 31, 2017	Jul. 25, 2017
Maximum Consolidated Leverage Ratio [Abstract]
Maximum consolidated leverage ratio, March 31, 2017		4.00
Maximum consolidated leverage ratio, June 30, 2017		4.25
Maximum consolidated leverage ratio, September 30, 2017		3.75
Maximum consolidated leverage ratio, December 31, 2017		3.50
Maximum consolidated leverage ratio, March 31, 2018 and each fiscal quarter thereafter		3.25
Minimum Consolidated Fixed Charge Coverage Ratio [Abstract]
Minimum consolidated fixed charge coverage ratio, March 31, 2017		1.10
Minimum consolidated fixed charge coverage ratio, June 30, 2017		1.05
Minimum consolidated fixed charge coverage ratio, September 30, 2017		1.05
Minimum consolidated fixed charge coverage ratio, December 31, 2017		1.10
Minimum consolidated fixed charge coverage ratio, March 31, 2018 and each fiscal quarter thereafter		1.25
Pricing Levels for Leverage Ratios [Abstract]
Interest rate on loan		4.38%	4.07%
Long-term debt [Abstract]
Long-term debt		$ 107,500	$ 99,583
Debt issuance costs		(408)	(501)
Total long-term debt		107,092	99,082
Less current portion including loan fees		8,061	8,061
Total long-term debt, less current portion including loan fees		$ 99,031	91,021
Leverage Ratio, Less than 1.50 to 1.00 [Member]
Pricing Levels for Leverage Ratios [Abstract]
Commitment fee		0.25%
Leverage Ratio, Less than 1.50 to 1.00 [Member] \| Maximum [Member]
Pricing Levels for Leverage Ratios [Abstract]
Consolidated leverage ratio		1.50
Leverage Ratio, Greater than or Equal to 1.50 to 1.00 but Less than 2.00 to 1.00 [Member]
Pricing Levels for Leverage Ratios [Abstract]
Commitment fee		0.25%
Leverage Ratio, Greater than or Equal to 1.50 to 1.00 but Less than 2.00 to 1.00 [Member] \| Minimum [Member]
Pricing Levels for Leverage Ratios [Abstract]
Consolidated leverage ratio		1.50
Leverage Ratio, Greater than or Equal to 1.50 to 1.00 but Less than 2.00 to 1.00 [Member] \| Maximum [Member]
Pricing Levels for Leverage Ratios [Abstract]
Consolidated leverage ratio		2.00
Leverage Ratio, Greater than or Equal to 2.00 to 1.00 but Less than 3.00 to 1.00 [Member]
Pricing Levels for Leverage Ratios [Abstract]
Commitment fee		0.375%
Leverage Ratio, Greater than or Equal to 2.00 to 1.00 but Less than 3.00 to 1.00 [Member] \| Minimum [Member]
Pricing Levels for Leverage Ratios [Abstract]
Consolidated leverage ratio		2.00
Leverage Ratio, Greater than or Equal to 2.00 to 1.00 but Less than 3.00 to 1.00 [Member] \| Maximum [Member]
Pricing Levels for Leverage Ratios [Abstract]
Consolidated leverage ratio		3.00
Leverage Ratio, Greater than or Equal to 3.00 to 1.00 but Less than 3.50 to 1.00 [Member]
Pricing Levels for Leverage Ratios [Abstract]
Commitment fee		0.375%
Leverage Ratio, Greater than or Equal to 3.00 to 1.00 but Less than 3.50 to 1.00 [Member] \| Minimum [Member]
Pricing Levels for Leverage Ratios [Abstract]
Consolidated leverage ratio		3.00
Leverage Ratio, Greater than or Equal to 3.00 to 1.00 but Less than 3.50 to 1.00 [Member] \| Maximum [Member]
Pricing Levels for Leverage Ratios [Abstract]
Consolidated leverage ratio		3.50
Leverage Ratio, Greater than or Equal to 3.50 to 1.00 [Member]
Pricing Levels for Leverage Ratios [Abstract]
Commitment fee		0.375%
Leverage Ratio, Greater than or Equal to 3.50 to 1.00 [Member] \| Minimum [Member]
Pricing Levels for Leverage Ratios [Abstract]
Consolidated leverage ratio		3.50
Revolving Facility [Member]
Pricing Levels for Leverage Ratios [Abstract]
Maximum borrowing capacity		$ 60,000		$ 40,000
Maturity date		Oct. 01, 2019
Available remaining borrowing capacity		$ 14,900
Available remaining borrowing capacity to maintain covenant compliance		10,000
Long-term debt [Abstract]
Long-term debt		$ 45,000	35,000
Acquisition Loan [Member]
Pricing Levels for Leverage Ratios [Abstract]
Maturity date		Sep. 30, 2019
Total long-term debt	$ 70,000
Amortization period for principal on acquisition term loan		10 years
Quarterly installment amount of acquisition term loan		$ 1,800
Long-term debt [Abstract]
Long-term debt		45,500	47,250
Less current portion including loan fees		7,000	7,000
Total long-term debt, less current portion including loan fees		$ 38,500	40,300
Term Loan [Member]
Pricing Levels for Leverage Ratios [Abstract]
Maturity date		Sep. 30, 2019
Amount of multiple advance loan that was available to be borrowed		$ 25,000
Quarterly installment amount of acquisition term loan		300
Long-term debt [Abstract]
Long-term debt		17,000	17,333
Less current portion including loan fees		1,300	1,300
Total long-term debt, less current portion including loan fees		$ 15,700	$ 16,000
LIBOR [Member] \| Leverage Ratio, Less than 1.50 to 1.00 [Member]
Pricing Levels for Leverage Ratios [Abstract]
Basis spread on variable rate		2.00%
LIBOR [Member] \| Leverage Ratio, Greater than or Equal to 1.50 to 1.00 but Less than 2.00 to 1.00 [Member]
Pricing Levels for Leverage Ratios [Abstract]
Basis spread on variable rate		2.25%
LIBOR [Member] \| Leverage Ratio, Greater than or Equal to 2.00 to 1.00 but Less than 3.00 to 1.00 [Member]
Pricing Levels for Leverage Ratios [Abstract]
Basis spread on variable rate		2.50%
LIBOR [Member] \| Leverage Ratio, Greater than or Equal to 3.00 to 1.00 but Less than 3.50 to 1.00 [Member]
Pricing Levels for Leverage Ratios [Abstract]
Basis spread on variable rate		2.75%
LIBOR [Member] \| Leverage Ratio, Greater than or Equal to 3.50 to 1.00 [Member]
Pricing Levels for Leverage Ratios [Abstract]
Basis spread on variable rate		3.00%
Base Rate [Member] \| Leverage Ratio, Less than 1.50 to 1.00 [Member]
Pricing Levels for Leverage Ratios [Abstract]
Basis spread on variable rate		1.00%
Base Rate [Member] \| Leverage Ratio, Greater than or Equal to 1.50 to 1.00 but Less than 2.00 to 1.00 [Member]
Pricing Levels for Leverage Ratios [Abstract]
Basis spread on variable rate		1.25%
Base Rate [Member] \| Leverage Ratio, Greater than or Equal to 2.00 to 1.00 but Less than 3.00 to 1.00 [Member]
Pricing Levels for Leverage Ratios [Abstract]
Basis spread on variable rate		1.50%
Base Rate [Member] \| Leverage Ratio, Greater than or Equal to 3.00 to 1.00 but Less than 3.50 to 1.00 [Member]
Pricing Levels for Leverage Ratios [Abstract]
Basis spread on variable rate		1.75%
Base Rate [Member] \| Leverage Ratio, Greater than or Equal to 3.50 to 1.00 [Member]
Pricing Levels for Leverage Ratios [Abstract]
Basis spread on variable rate		2.00%