Income Taxes Income Taxes - Income Tax Reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ (6,245,000)	$ 15,171,000	$ 117,691,000
Effective Income Tax Rate Reconciliation, Deduction, Extraterritorial Income Exclusion, Amount	(222,019,000)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	(23,124,000)
Valuation Allowances and Reserves, Additions for Charges to Other Accounts	89,217,000	4,200,000	0
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	(21,163,000)	(1,766,000)	(8,505,000)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount	3,112,000
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	(4,020,000.000)	1,155,000.000	(3,936,000.000)
Income Tax Expense (Benefit)	$ (184,242,000)	$ 18,760,000	$ 105,250,000