CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
NET INCOME (LOSS)	$ 24,802	$ 114,183	$ (14,322)
Other Comprehensive Income (Loss), net of tax:
Defined benefit pension plan—amortization of net (loss) gain		(75)	87
Minimum pension liability adjustment of unconsolidated affiliate			(1,772)
Total Comprehensive Income (Loss)	24,802	114,108	(16,007)
Less: Comprehensive income attributable to non-controlling interest			(103)
Comprehensive Income (Loss), net of tax	$ 24,802	$ 114,108	$ (16,110)