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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2010
Income Tax Disclosure [Abstract]        
Valuation allowance $ 1,983,642 $ 649,592 $ 753,500  
Operating Loss Carryforwards [Line Items]        
Unrecognized excess tax benefits from stock based compensation 17,700      
Unrecognized tax benefits $ 81 $ 77 $ 1,382  
Earliest Tax Year        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards expiration year 2025      
Latest Tax Year        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards expiration year 2035      
Alternative Minimum Tax Credit Carryforward        
Tax Credit Carryforward [Line Items]        
Alternative minimum tax credits, not subject to expiration $ 9,300      
Domestic Tax Authority        
Operating Loss Carryforwards [Line Items]        
Federal net operating loss carryovers 3,200,000      
Operating loss carryforwards subject to IRC Section 382 limitation       $ 929,400
Net operating loss carryovers, subject to expiration $ 552,600