Annual report pursuant to Section 13 and 15(d)

Income Taxes (Federal Operating Loss Carryforwards) (Details)

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Income Taxes (Federal Operating Loss Carryforwards) (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Operating Loss Carryforwards [Line Items]  
Federal NOL carryforwards $ 308,385
2016-2021 [Member]  
Operating Loss Carryforwards [Line Items]  
Federal NOL carryforwards 13,892
2022-2024 [Member]  
Operating Loss Carryforwards [Line Items]  
Federal NOL carryforwards 101,495
2025-2027 [Member]  
Operating Loss Carryforwards [Line Items]  
Federal NOL carryforwards 39,714
2028-2030 [Member]  
Operating Loss Carryforwards [Line Items]  
Federal NOL carryforwards 32,111
2031-2035 [Member]  
Operating Loss Carryforwards [Line Items]  
Federal NOL carryforwards $ 121,173