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, 2018
USD ($)
Operating Loss Carryforwards [Line Items]  
Federal NOL carryforwards $ 662,712
2019-2024  
Operating Loss Carryforwards [Line Items]  
Federal NOL carryforwards 115,387
2025-2027  
Operating Loss Carryforwards [Line Items]  
Federal NOL carryforwards 39,714
2028-2030  
Operating Loss Carryforwards [Line Items]  
Federal NOL carryforwards 32,111
2031-2033  
Operating Loss Carryforwards [Line Items]  
Federal NOL carryforwards 22,164
2034-2038  
Operating Loss Carryforwards [Line Items]  
Federal NOL carryforwards $ 453,336