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Income Taxes Income Taxes - Current and Deferred Tax Positions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current tax provision (benefit):      
U.S. federal $ (99) $ 75  
State 326 377 $ 912
Total current 227 452 912
Deferred tax provision (benefit):      
U.S. federal (17,246) (35,597) 6,197
State (518) (4,000) (959)
Deferred Income Tax Expense (Benefit), Total (17,764) (39,597) 5,238
Provision for (benefit from) income taxes $ (17,537) $ (39,145) $ 6,150