Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Inventories	$ 2,108	$ 2,009
Compensation and benefits	3,902	3,675
Insurance	281	387
Depreciation and amortization	1,297	1,013
Net operating loss carryforwards	39,846	48,166
General business credit carryforwards	12,990	12,697
Other reserves	5,643	7,493
Gross deferred tax assets	66,067	75,440
Less: Valuation allowance	(59,391)	(67,907)
Deferred tax assets less valuation allowance	6,676	7,533
Deferred tax liabilities:
Depreciation and amortization	(13,282)	(20,910)
Basis difference - equity investee	(31,016)	(31,016)
Other	(1,074)	(976)
Gross deferred tax liabilities	(45,372)	(52,902)
Net deferred tax liability	$ (38,696)	$ (45,369)