Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income	$ 136	$ 18,806	$ 18,939	$ 53,572
Other comprehensive (loss) income, net of tax
Cash flow hedge adjustments, net of taxes of $82 and $(603)for the three and nine months ended September 30, 2017	(134)	0	985	0
Foreign currency translation adjustment, net of taxes of $0 and $(19) for the three months ended September 30, 2017 and 2016, respectively, and $56 and $394 for the nine months ended September 30, 2017 and 2016, respectively	5,833	700	16,747	2,532
Other Adjustments, Net of Taxes of $0 for all periods	(90)	0		0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent			(238)
Other comprehensive income (loss), net of taxes	5,609	700	17,494	2,532
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	5,745	19,506	36,433	56,104
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	82	0	(603)	0
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	0	(19)	56	(394)
Other Comprehensive (Income) Loss, Other Adjustments, Tax	$ 0	$ 0	$ 0	$ 0