Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Income Taxes (Details)

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Income Taxes - Reconciliation of Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
U.S. statutory rate $ 10,393 $ 4,159 $ 24,136
Increase (decrease) resulting from:      
Permanent differences (85) (206) (330)
State income taxes 173 (571) 366
Other (13) 374 (118)
Vesting of common stock 13 (19) (253)
Change in valuation allowance (10,385) (4,308) 392
Income tax (expense) benefit $ 96 $ (571) $ 24,193
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
U.S. statutory rate 21.00% 21.00% 35.00%
Increase (decrease) resulting from:      
Permanent differences (0.20%) (1.00%) 0.50%
State income taxes 0.40% (2.90%) (0.50%)
Other 0.00% 1.90% 0.20%
Vesting of common stock 0.00% (0.10%) 0.40%
Change in valuation allowance (21.00%) (21.70%) (0.50%)
Income tax (expense) benefit 0.20% (2.80%) 35.10%