Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Expense [Line Items]
Effective income tax rate	19.80%		16.60%	(61.70%)	17.30%
Income tax expense (benefit)	$ 4,808		$ 5,020	$ (22,802)	$ 10,293
Increase (decrease) in income taxe expense compared to the same period in 2018	$ (200)
Income tax expense (benefit) related to unremitted earnings of foreign subsidiaries		$ 26,700
Corporate Restructuring [Member]
Income Tax Expense [Line Items]
Income tax expense (benefit)				$ (58,500)