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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Gross balance at beginning of year	$ 5,514	$ 5,290	$ 7,772
Increases related to prior year tax positions	5,161	0	185
Decreases related to prior year tax positions	0	(277)	0
Increases related to current year tax positions	3,704	669	918
Settlements	(956)	(159)	(3,369)
Decreases due to lapse of statutes of limitations	(1,483)	(187)	(252)
Currency adjustments	(484)
Currency adjustments		178	36
Gross balance at end of year	11,456	5,514	5,290
Uncertain Tax Positions [Abstract]
Unrecognized tax benefits that would impact effective tax rate	11,400	5,200
Interest and penalties expenses/(benefits)	1,300	700	(800)
Accrued interest and penalties	2,900	$ 1,600	$ 900
Minimum [Member]
Uncertain Tax Positions [Abstract]
Estimated increase in gross unrecognized tax benefits within next 12 months	500
Maximum [Member]
Uncertain Tax Positions [Abstract]
Estimated increase in gross unrecognized tax benefits within next 12 months	$ 2,000
Statute of limitations related to income tax examinations	10 years

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