Income Taxes - Provisions for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Other Tax Expense (Benefit)	$ 23,000	$ 189,000
Current:
Domestic	(1,564)	13,390	$ (6,899)
Foreign	16,146	37,381	25,561
Total current	14,582	50,771	18,662
Deferred:
Domestic	(22,905)	(213,200)	(8,617)
Foreign	34,817	(21,813)	8,715
Total deferred	11,912	(235,013)	98
Income Tax Expense (Benefit)	26,494	(184,242)	18,760
Cash taxes paid	$ 29,737	$ 43,347	$ 75,819