Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net loss	$ (19,030)	$ (4,087)
Other comprehensive income (loss):
Amortization of accumulated actuarial gains or losses, pension	359	741
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	5	1,001
Tax effect of other comprehensive income gains	(138)	0
Other comprehensive income	226	1,742
Comprehensive loss attributable to the Parent company	$ (18,804)	$ (2,345)