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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost related to nonvested awards     $ 7,253 $ 5,621  
Dividends declared not paid on restricted stock units $ 139 $ 168 $ 139 168  
Award vesting, percentage     181.00%    
Maximum worth of award per participant     $ 25    
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair value of restricted stock units vested and released 3,549 1,488 4,597 6,503  
Compensation cost related to nonvested awards 4,651 1,836 $ 6,666 $ 5,621  
Granted (in shares)     353,891,000 167,343,000  
Restricted Stock Units (RSUs) | Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost related to nonvested awards 237 $ 186 $ 615 $ 537  
Stock-Settled EBI Units and Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to nonvested awards 14,533   $ 14,533   $ 11,499
Expected weighted-average period to be recognized     2 years 3 months 3 days   2 years
Dividends declared not paid on restricted stock units 533   $ 533   $ 375
Performance Based Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost related to nonvested awards 171   587    
Unrecognized compensation cost related to nonvested awards $ 2,775   $ 2,775    
Expected weighted-average period to be recognized     2 years 4 months 24 days    
Criteria period     3 years    
Vesting period     3 years    
Granted (in shares)     53,147    
Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Purchase price percentage of subsequent offering periods     95.00%    
Maximum number of shares issuable (in shares) 200,000   200,000    
Maximum number of shares per participant (in shares)     725    
Shares issued under plan (in shares) 18,034,000 12,558,000 30,179,000 23,171,000  
Number of shares reserved for issuance (in shares) 2,379,006   2,379,006   2,409,185
Minimum | Performance Based Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Core return threshold percentages     0.00%    
Maximum | Performance Based Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Core return threshold percentages     200.00%