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Income Taxes (Components of Provision for Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current benefit (provision):      
Federal benefit (expense) $ 86 $ 164 $ (3,031)
State (expense) benefit (55) 78 (257)
Total current benefit (provision) 31 242 (3,288)
Deferred benefit (provision):      
Federal benefit (expense) 662 (314) 21,575
Total deferred benefit (expense) 662 (314) 21,575
Total income tax benefit (expense) $ 693 $ (72) $ 18,287