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Capital Structure - Preferred Stock (Details) - Preferred Stock
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
shares
Increase (Decrease) in Temporary Equity [Roll Forward]  
Beginning balance (in shares) | shares 217
Amortization of preferred stock issuance costs (in shares) | shares 0
Issuance of preferred PIK dividend (in shares) | shares 33
Ending balance (in shares) | shares 250
Beginning balance | $ $ 200,865
Amortization of preferred stock issuance costs | $ 3,530
Issuance of preferred PIK dividend | $ 33,246
Ending balance | $ $ 237,641