Annual report pursuant to Section 13 and 15(d)

Income Taxes - Net Operating Loss and Tax Credit Carryovers (Details)

v3.3.1.900
Income Taxes - Net Operating Loss and Tax Credit Carryovers (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Internal Revenue Service (IRS)  
Operating Loss Carryforwards [Line Items]  
Net operating loss $ 418,417
Internal Revenue Service (IRS) | Minimum  
Operating Loss Carryforwards [Line Items]  
Net operating loss, expiration year Dec. 31, 2032
Internal Revenue Service (IRS) | Maximum  
Operating Loss Carryforwards [Line Items]  
Net operating loss, expiration year Dec. 31, 2035
State and Local Jurisdiction  
Operating Loss Carryforwards [Line Items]  
Net operating loss $ 100,651
State and Local Jurisdiction | Minimum  
Operating Loss Carryforwards [Line Items]  
Net operating loss, expiration year Dec. 31, 2021
State and Local Jurisdiction | Maximum  
Operating Loss Carryforwards [Line Items]  
Net operating loss, expiration year Dec. 31, 2029
Alternative Minimum Tax Credit  
Operating Loss Carryforwards [Line Items]  
Tax credit carryforward $ 12,091
Tax credit carryforward, expiration year description Indefinite
General Business Tax Credit Carryforward  
Operating Loss Carryforwards [Line Items]  
Tax credit carryforward $ 406
General Business Tax Credit Carryforward | Minimum  
Operating Loss Carryforwards [Line Items]  
Tax credit carryforward, expiration year Dec. 31, 2027
General Business Tax Credit Carryforward | Maximum  
Operating Loss Carryforwards [Line Items]  
Tax credit carryforward, expiration year Dec. 31, 2028