Income Taxes Income Tax Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Tax at the Netherlands income tax rate									$ (23,005)	$ 22,895	$ 26,189
International earnings taxed at rates other than the Netherlands statutory rate									14,986	(1,343)	(14,997)
Non-deductible expenses									2,977	3,516	4,452
Change in valuation allowance									23	(3,491)	1,513
State and provincial taxes									(227)	(825)	1,566
Tax credits									(5,975)	(3,893)	(3,939)
Benefit from corporate restructuring										(59,336)
Unremitted earnings of subsidiaries									418	26,126
Adjustments of prior year taxes									545	(1,684)	2,350
Adjustments of income tax reserves									(1,965)	1,084	(1,613)
Non-deductible goodwill impairment									15,547
Foreign exchange									226	2,014	5,936
Accrued withholding taxes									2,092	2,603	2,911
Other									254	44	1,079
Income tax expense (benefit)	$ 6,540	$ 3,663	$ (261)	$ (4,046)	$ 7,177	$ 3,335	$ 4,808	$ (27,610)	$ 5,896	$ (12,290)	$ 25,447