Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of the differences between taxes on income (loss) before income taxes
Taxes (benefit) on U.S. and other international earnings (losses) at greater than the Bermuda rate	$ (181,426)	$ (109,101)	$ (83,747)
Increase (decrease) in valuation allowance	17,865	22,655	(9,934)
Tax reserves and interest	(3,468)	(12,679)	166,347
State income taxes (benefit)	(19,802)	1,087	(10,000)
Total income tax expense (benefit)	$ (186,831)	$ (98,038)	$ 62,666
Effective tax rate (as a percent)	15.60%	22.90%	(10.40%)