Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Expense [Line Items]
Effective income tax rate	12.10%		29.80%	(30.20%)	21.70%
Income tax expense (benefit)	$ 3,335		$ 9,404	$ (19,467)	$ 19,697
Increase (decrease) in income tax expense compared to the same period in 2018	$ (6,100)
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)