Summary of Significant Accounting Policies, Uncertain Tax Positions (Details) - Multiple Foreign and Domestic Authorities [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Gross balance at beginning of year	$ 7,772	$ 5,987	$ 7,484
Increases related to prior year tax positions	185	1,677	0
Increases related to current year tax positions	918	1,119	2,700
Settlements	(3,369)	0	0
Decreases due to lapse of statutes of limitations	(252)	(667)	(4,106)
Currency adjustments		(344)	(91)
Currency adjustments	36
Gross balance at end of year	5,290	7,772	5,987
Unrecognized tax benefits that would impact effective tax rate	1,000	900
Uncertain Tax Positions [Abstract]
Interest and penalties expenses/(benefits)	(800)	400	400
Accrued interest and penalties	$ 900	$ 1,700	$ 1,300