Income Taxes - Tax Effect of Significant Items Comprising the Net Deferred Tax Asset (Liability) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax asset:
Benefits from net operating loss carryforwards	$ 18,887	$ 23,539
Long-term incentive compensation plans	17,092	18,694
Other, primarily accrued expenses deductible when paid	18,490	19,737
Deferred tax assets, gross	54,469	61,970
Less: valuation allowance	(13,709)	(13,927)
Deferred tax asset	40,760	48,043
Deferred tax liability:
Intangible assets	6,520	6,874
Investment in foreign subsidiaries	8,220	8,725
Other	766	1,900
Deferred tax liability	15,506	17,499
Net deferred tax asset	$ 25,254	$ 30,544