Quarterly report pursuant to Section 13 or 15(d)

LIABILITIES AND LONG-TERM DEBT (Details)

LIABILITIES AND LONG-TERM DEBT (Details) - USD ($) $ in Thousands		9 Months Ended
	Oct. 01, 2014	Sep. 30, 2017	Jul. 25, 2017	Dec. 31, 2016
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]
Maturity date		Sep. 30, 2019
Short-term amount outstanding		$ 8,061		$ 10,145
Long-term amount outstanding		81,011		73,107
Debt issuance cost		$ 600		$ 700
Interest rate on loan		3.74%		3.27%
Leverage Ratio, Less than 1.50 to 1.00 [Member]
Pricing Levels for Leverage Ratios [Abstract]
Commitment fee		0.25%
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%
Consolidated leverage ratio		3.50
Revolving Facility [Member]
Pricing Levels for Leverage Ratios [Abstract]
Maturity date		Oct. 01, 2019
Maximum borrowing capacity		$ 60,000	$ 40,000
Borrowed funds under the agreement		23,000		$ 9,000
Available remaining borrowing capacity		37,000
Available remaining borrowing capacity to maintain covenant compliance		31,000
TOCCO [Member]
Long-term debt [Abstract]
Long-term debt		89,666		84,000
Less debt issuance costs		594		748
Carrying balance of debt		89,072		83,252
TOCCO [Member] \| Revolving Facility [Member]
Long-term debt [Abstract]
Long-term debt		23,000		9,000
Term Note One [Member] \| Revolving Facility [Member]
Pricing Levels for Leverage Ratios [Abstract]
Short-term amount outstanding		1,300		1,700
Long-term amount outstanding		16,300		17,300
Amount of multiple advance loan that was available to be borrowed		25,000
Acquisition Loan [Member] \| TOCCO [Member]
Long-term debt [Abstract]
Long-term debt		49,000		56,000
Term Loan [Member] \| TOCCO [Member]
Long-term debt [Abstract]
Long-term debt		17,666		19,000
Term Note [Member]
Pricing Levels for Leverage Ratios [Abstract]
Short-term amount outstanding		7,000		8,800
Long-term amount outstanding		$ 42,000		$ 47,300
Total long-term debt	$ 70,000
Amortization period for principal on acquisition term loan		10 years
Quarterly installment amount of acquisition term loan		$ 1,750
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%