Income Taxes - Tax Effect of Significant Items Comprising the Net Deferred Tax Asset (Liability) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax asset:
Benefits from net operating loss carryforwards	$ 6,066	$ 18,887
Long-term incentive compensation plans	15,468	17,092
Other, primarily accrued expenses deductible when paid	16,730	18,490
Deferred tax assets, gross	38,264	54,469
Less: valuation allowance	(462)	(13,709)
Deferred tax asset	37,802	40,760
Deferred tax liability:
Intangible assets	6,302	6,520
Translation adjustment	0	8,220
Other	1,960	766
Deferred tax liability	8,262	15,506
Net deferred tax asset	$ 29,540	$ 25,254