Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Foreign tax rate differential			(38.40%)	18.90%	8.70%
Foreign deferred tax assets			(3.40%)
Foreign tax rate changes			5.00%
Foreign permanent differences			(5.70%)
Other, net			3.40%	(0.30%)	1.40%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount			$ 800
Valuation allowance	$ (3,028)	$ (892)	(3,028)	$ (892)	$ (9,448)	$ (13,928)
Foreign earnings repatriated	32,000
Tax benefit from foreign earnings repatriated			2,600
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount			(1,600)
Valuation allowance related to operating loss carryfowards	1,800		1,800
Foreign tax credits	17,700	7,800	17,700	7,800
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	1,500	4,400	1,500	4,400
State net operating losses	57,200	51,900	57,200	51,900
State tax credits	2,000	2,000	2,000	2,000
Valuation Allowance, Deferred Tax Asset, Decrease, Amount			(121)	(7,798)	(5,705)
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount		300
Unrecognized Tax Benefits	3,000	2,937	3,000	2,937	$ 1,978	$ 1,612
Accrued interest and penalties	200	100	200	100
Uncertain income tax position	2,900		2,900
Increase in Unrecognized Tax Benefits is Reasonably Possible	1,000		1,000
Undistributed earnings of foreign subsidiaries	222,600	202,800	222,600	202,800
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	$ 2,200		$ 2,200
Income Tax Examination, Penalties and Interest Accrued		$ 900		$ 900