Income Taxes Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%	35.00%
Income Tax Expense (Benefit)	$ (118,207)	$ (50,092)	$ (166,008)
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	$ 1,600
Tax Cuts and Jobs Act 2017 [Member]
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Income Tax Expense (Benefit)		120,900
Taxes Payable		3,300
Deferred Tax Liabilities, Deferred Expense	$ 0	$ 124,166
Accounting Standards Update 2014-09 [Member]
Income Tax Contingency [Line Items]
Deferred Tax Liabilities, Other	$ 29,729