Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net loss	$ (37,851)	$ (63,154)	$ (51,729)	$ (82,185)
Other comprehensive income (loss):
Amortization of accumulated actuarial gains or losses, pension	1,157	359	2,267	717
Adjustments to accumulated actuarial losses and transition obligations, pension	(488)	0	(285)	0
Amortization of accumulated actuarial gains or losses, transition obligations, and prior service costs, postretirement medical benefit	327	5	654	10
Tax effect of other comprehensive income gains	225	64	(350)	(224)
Change in foreign currency translation adjustment	4,924	9,477	(22,216)	9,477
Unrealized and realized gains and losses on available-for-sale securities	(1,785)	0	(1,460)	0
Other comprehensive income	4,360	9,905	(21,390)	9,980
Comprehensive loss attributable to the Parent company	$ (33,491)	$ (53,249)	$ (73,119)	$ (72,205)