Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Expense [Line Items]
Effective income tax rate	(217.60%)	18.10%
Effective income tax rate excluding discrete items	19.70%	20.90%
Income tax expense (benefit)	$ (27,610)	$ 5,273
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)