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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost related to nonvested awards     $ 4,233 $ 3,785  
Dividends declared not paid on restricted stock units $ 77 $ 119 $ 77 119  
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 1,048 482 4,299 5,015  
Compensation cost related to nonvested awards 2,015 2,147 $ 3,817 $ 3,785  
Granted (in shares)     132,605,000 165,761,000  
Restricted Stock Units (RSUs) | Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost related to nonvested awards 231 $ 179 $ 378 $ 351  
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 10,810   $ 10,810   $ 11,499
Expected weighted-average period to be recognized     2 years 2 months 15 days   2 years
Dividends declared not paid on restricted stock units 452   $ 452   $ 375
Performance Based Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost related to nonvested awards 335   416    
Unrecognized compensation cost related to nonvested awards $ 3,067   $ 3,067    
Expected weighted-average period to be recognized     2 years 7 months 20 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) 0 0 12,145,000 10,613,000  
Number of shares reserved for issuance (in shares) 2,397,040   2,397,040   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%