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Summary of Significant Accounting Policies, Uncertain Tax Positions (Details) - Multiple Foreign and Domestic Authorities [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Gross balance at beginning of year	$ 5,290	$ 7,772	$ 5,987
Increases related to prior year tax positions	0	185	1,677
Decrease related to prior year tax positions	(277)	0	0
Increases related to current year tax positions	669	918	1,119
Settlements	(159)	(3,369)	0
Decreases due to lapse of statutes of limitations	(187)	(252)	(667)
Currency adjustments			(344)
Currency adjustments	178	36
Gross balance at end of year	5,514	5,290	7,772
Uncertain Tax Positions [Abstract]
Unrecognized tax benefits that would impact effective tax rate	5,200	1,000
Interest and penalties expenses/(benefits)	700	(800)	400
Accrued interest and penalties	1,600	$ 900	$ 1,700
Minimum [Member]
Uncertain Tax Positions [Abstract]
Estimated increase in gross unrecognized tax benefits within next 12 months	2,500
Maximum [Member]
Uncertain Tax Positions [Abstract]
Estimated increase in gross unrecognized tax benefits within next 12 months	$ 3,500

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