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Basis of Presentation and Summary of Significant Accounting Policies Correction of Immaterial Error (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Liabilities $ 905,323 $ 903,186    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (240,502) (226,569) $ (221,492) $ (197,656)
Accumulated Deficit        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ (102,303) $ (86,213) $ (71,680) $ (57,904)