Annual report pursuant to Section 13 and 15(d)

INCOME TAXES (Details)

v3.8.0.1
INCOME TAXES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Provision for income taxes [Abstract]        
Current federal provision (benefit)   $ (1,202) $ 1,691 $ 4,062
Current state provision   282 18 285
Deferred federal provision (benefit)   (6,320) 8,645 5,367
Deferred state provision   81 150 50
Total tax expense (benefit)   (7,159) 10,504 9,764
Income tax expense or liability in Saudi Arabia   $ 0 $ 0 $ 0
Federal statutory rate   35.00% 35.00% 35.00%
Provisional adjustment resulted in a increase in income tax receivable   $ (961,000)    
Effective tax rate in income tax expense and the Federal statutory rate [Abstract]        
Income taxes at U.S. statutory rate   3,885 $ 10,476 $ 9,927
State taxes, net of federal benefit   235 285 230
Net operating loss carryback   (961) 0 0
Permanent and other items   (11) (257) (393)
Deferred tax impact of US tax reform   (10,307) 0 0
Total tax expense (benefit)   (7,159) 10,504 $ 9,764
Deferred tax liabilities [Abstract]        
Plant, pipeline and equipment   (17,014) (22,598)  
Intangible assets   (778) (786)  
Other assets   (4) (10)  
Investment in AMAK   (1,023) (3,109)  
Total deferred tax liabilities   (18,819) (26,503)  
Deferred tax assets [Abstract]        
Accounts receivable   198 322  
Inventory   156 1,283  
Mineral interests   226 376  
Unrealized loss on swap agreements   0 20  
Post-retirement benefits   252 423  
Stock-based compensation   971 1,372  
Gross deferred tax assets   1,803 3,796  
Valuation allowance   (226) (376)  
Total net deferred tax assets   1,577 3,420  
Net deferred tax liabilities   (17,242) (23,083)  
Change in valuation allowance   150 0  
Accrued interest or penalties related to uncertain tax positions   $ 0 $ 0  
Plan [Member]        
Provision for income taxes [Abstract]        
Federal statutory rate 21.00%