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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Inventories $ 2,156 $ 2,108
Compensation and benefits 4,785 3,902
Insurance 245 281
Depreciation and amortization 1,310 1,297
Net operating loss carryforwards 28,952 39,846
General business credit carryforwards 14,135 12,990
Other reserves 7,609 5,643
Gross deferred tax assets 59,192 66,067
Less: Valuation allowance (11,125) (59,391)
Deferred tax assets less valuation allowance 48,067 6,676
Deferred tax liabilities:    
Depreciation and amortization (14,911) (13,282)
Basis difference - equity investee (31,016) (31,016)
Other (1,358) (1,074)
Gross deferred tax liabilities (47,285) (45,372)
Net deferred tax asset $ 782  
Net deferred tax (liabilities)   $ (38,696)