Income Taxes Income Tax Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax at the Netherlands income tax rate									$ 22,895	$ 26,189	$ 25,427
International earnings taxed at rates other than the Netherlands statutory rate									(1,343)	(14,997)	(12,496)
Non-deductible expenses									3,516	4,452	6,645
Change in valuation allowance									(3,491)	1,513	(1,744)
State and provincial taxes									(825)	1,566	829
Tax credits									(3,893)	(3,939)	218
Benefit from corporate restructuring									(59,336)
Unremitted earnings of subsidiaries									26,126
Adjustments of prior year taxes									(1,684)	2,350	(4,272)
Adjustments of income tax reserves									1,084	(1,613)	1,869
Foreign exchange									2,014	5,936	(1,792)
Accrued withholding taxes									2,603	2,911	3,067
Other									44	1,079	498
Income tax expense (benefit)	$ 7,177	$ 3,335	$ 4,808	$ (27,610)	$ 5,750	$ 9,404	$ 5,020	$ 5,273	$ (12,290)	$ 25,447	$ 18,249