Annual report pursuant to Section 13 and 15(d)

Income Taxes (Summary of Federal Operating Loss Carryforwards) (Details)

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Income Taxes (Summary of Federal Operating Loss Carryforwards) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Operating Loss Carryforwards [Line Items]  
Federal NOL carryforwards $ 463,985
2018-2023  
Operating Loss Carryforwards [Line Items]  
Federal NOL carryforwards 111,431
2024-2026  
Operating Loss Carryforwards [Line Items]  
Federal NOL carryforwards 14,408
2027-2029  
Operating Loss Carryforwards [Line Items]  
Federal NOL carryforwards 41,379
2030-2032  
Operating Loss Carryforwards [Line Items]  
Federal NOL carryforwards 42,158
2033-2037  
Operating Loss Carryforwards [Line Items]  
Federal NOL carryforwards $ 254,609