CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net (loss) income	$ (12,637)	$ 30,384	$ (5,025)
Other comprehensive (income) loss:
Amortization of prior service cost	167	177	177
Amortization of actuarial (gain) loss	(493)	125	18
Adjustments to net periodic postretirement (benefit) loss	(326)	302	195
Comprehensive (loss) income	$ (12,311)	$ 30,082	$ (5,220)