Consolidated Statements of Comprehensive Income - 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 income	$ 6,129	$ 11,076	$ 99,472	$ 10,706
Other comprehensive income (loss), net of tax:
Changes in pension liability and other post-retirement benefit obligations	0	0	2,022	0
Tax effect of changes in pension liability and other post-retirement benefit obligations	0	0	(395)	0
Foreign currency translation adjustments	347	110	(1,050)	(119)
Other comprehensive income (loss)	347	110	577	(119)
Comprehensive income	$ 6,476	$ 11,186	$ 100,049	$ 10,587