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Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator (for basic and diluted earnings per share)        
Income (loss) from continuing operations, net of tax $ 1,213 $ (17,512) $ 4,716 $ (24,710)
Less preferred stock dividends (12,576) 0 (24,219) 0
Numerator for basic and diluted earnings per share $ (11,363) $ (17,512) $ (19,503) $ (24,710)
Denominator        
Basic weighted-average shares outstanding 82,381 81,418 82,143 81,248
Effect of dilutive securities:        
Restricted stock units 0 0 0 0
Common stock warrant 0 0 0 0
Diluted weighted-average shares outstanding 82,381 81,418 82,143 81,248