Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ 3,024	$ (91,996)	$ 602	$ (94,828)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment		2,228	(2,660)	3,116	(2,007)
Unrealized loss on cash flow hedges, net of tax benefit of $0, $291 and $0, $903		(202)	(455)	(201)	(1,423)
Reclassification of pension liability adjustments to earnings, net of tax expense of $0, $38 and $0, $77	[1]	112	74	221	150
Other comprehensive income (loss)		2,138	(3,041)	3,136	(3,280)
Comprehensive income (loss)		$ 5,162	$ (95,037)	$ 3,738	$ (98,108)

[1] Reclassifications out of accumulated other comprehensive loss for pension obligations are charged to selling and administrative expense.