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Summary of Significant Accounting Policies - Equity-based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense $ 27,300  
Weighted-average remaining term (years) 2 years 8 months 12 days  
Equity Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares available for future issuance (shares) 20,000,000.0  
Common Stock [Member] | Equity Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued in period (shares) 4,000,000.0  
Cumulative Restricted share awards (shares) 800,000  
Cumulative Restricted share awards forfeited (shares) 700,000  
Cumulative Restricted Stock Units (shares) 1,900,000  
Cumulative Restricted Stock Units forfeited (shares) 400,000  
Cumulative Deferred Stock Units (shares) 200,000  
Cumulative Stock Options (shares) 1,100,000  
Cumulative stock options forfeited (shares) 100,000  
Common Stock [Member] | Non-Executive Director Restricted Share Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued in period (shares) 9,000  
Shares available for future issuance (shares) 19,800  
General and Administrative Expense [Member] | Equity Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 2,892 $ 2,855
General and Administrative Expense [Member] | Time-Based Restricted Stock Units [Member] | Equity Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 1,438 1,386
General and Administrative Expense [Member] | Long Term Incentive Target Awards [Member] | Equity Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 1,115 1,098
General and Administrative Expense [Member] | Deferred Stock Units [Member] | Equity Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 85 72
General and Administrative Expense [Member] | Stock Options [Member] | Equity Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 254 $ 299