Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details)

v3.3.1.900
Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Tax Credit Carryforward [Line Items]      
Effective income tax rate reconciliation, at federal statutory income tax rate, percent 35.00%    
Valuation allowance, deferred tax asset, increase (decrease), amount $ 32,204    
Change in valuation allowance affecting tax expense 24,149 $ 9,322 $ 1,760
Increase (decrease) in deferred tax assets valuation allowance related to changes in derivative fair values 3,312    
Increase (decrease) in other adjustments in deferred tax assets valuation allowance 4,743    
Operating loss carryforwards, limitation as per IRC 129,521    
Alternative minimum tax credit carryforwards 426    
Unrecognized tax benefits, income tax penalties and interest accrued 69    
Internal Revenue Service (IRS)      
Tax Credit Carryforward [Line Items]      
Operating loss carryforwards 456,165    
State and Local Jurisdiction      
Tax Credit Carryforward [Line Items]      
Operating loss carryforwards 146,225    
Tax credit carryforward, amount $ 1,012