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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost related to nonvested awards $ 1,883 $ 1,638  
Dividends declared not paid on restricted stock units 28 84  
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of restricted stock units vested and released 3,251 4,533  
Compensation cost related to nonvested awards $ 1,802 $ 1,638  
Granted (in shares) 109,347,000 142,008,000  
Restricted Stock Units (RSUs) | Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost related to nonvested awards $ 147 $ 172  
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 $ 12,667 $ 12,004  
Expected weighted-average period to be recognized 2 years 5 months 9 days 2 years 4 months 2 days  
Dividends declared not paid on restricted stock units $ 403   $ 375
Performance Based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost related to nonvested awards 81    
Unrecognized compensation cost related to nonvested awards $ 3,746    
Expected weighted-average period to be recognized 2 years 11 months 1 day    
Criteria period 3 years    
Vesting period 3 years    
Granted (in shares) 53,975    
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    
Maximum number of shares per participant (in shares) 725    
Maximum worth of award per participant $ 25,000    
Shares issued under plan (in shares) 12,145,000 10,613,000  
Number of shares reserved for issuance (in shares) 2,397,040 2,421,743  
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%