Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Income Taxes Computed to Income Tax Benefit (Details)

v3.8.0.1
Income Taxes - Reconciliation of Income Taxes Computed to Income Tax Benefit (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income tax (benefit) at the federal statutory rate $ 23,490 $ (102,339) $ (436,696)
Share-based compensation 664 4,920 2,940
State income taxes 63 (755) (2,343)
Debt restructuring cost 18 1,463  
Change in statutory federal tax rate 105,933    
Gain on exchange of debt (24,981)    
Valuation allowance (118,643) 52,915 232,925
Other 887 420 190
Total income tax (benefit) $ (12,569) $ (43,376) $ (202,984)
Income tax expense (benefit) at the federal statutory rate, tax rate 35.00% 35.00% 35.00%
Share-based compensation, tax rate 1.00% (1.70%) (0.20%)
State income taxes, tax rate 0.10% 0.20% 0.20%
Debt restructuring cost   (0.50%)  
Change in statutory federal tax rate 157.80%    
Gain on exchange of debt, tax rate (37.20%)    
Valuation allowance, tax rate (176.80%) (18.10%) (18.70%)
Other, tax rate 1.40% (0.10%)  
Total income tax (benefit), tax rate (18.70%) 14.80% 16.30%