Income Taxes - Summary of Changes In Tax Provisions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Movement In Deferred Tax Asset [Roll Forward]
Balance at December 31, 2014	$ 902,300
Valuation allowance	161,158
Balance at December 31, 2015	0
Deferred Tax Asset, Changes In Current Period
Movement In Deferred Tax Asset [Roll Forward]
Valuation allowance	(154,800)
Deferred Tax Asset, Changes In Current Period | Other Comprehensive Income (Loss)
Movement In Deferred Tax Asset [Roll Forward]
Valuation allowance	6,300
Deferred Tax Asset, Changes In Current Period | Income Tax Expense (Benefit)
Movement In Deferred Tax Asset [Roll Forward]
Valuation allowance	(161,100)
Deferred Tax Asset, Changes In Future Periods
Movement In Deferred Tax Asset [Roll Forward]
Valuation allowance	(747,500)
Deferred Tax Asset, Changes In Future Periods | Other Comprehensive Income (Loss)
Movement In Deferred Tax Asset [Roll Forward]
Valuation allowance	(60,800)
Deferred Tax Asset, Changes In Future Periods | Income Tax Expense (Benefit)
Movement In Deferred Tax Asset [Roll Forward]
Valuation allowance	$ (686,700)