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Stockholders' Equity - Narrative (Details)
3 Months Ended 6 Months Ended 149 Months Ended
May 03, 2022
$ / shares
shares
Jun. 30, 2022
USD ($)
measurement_period
$ / shares
shares
Mar. 31, 2022
shares
Jun. 30, 2021
USD ($)
$ / shares
shares
Mar. 31, 2021
shares
Jun. 30, 2022
USD ($)
measurement_period
$ / shares
shares
Jun. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
measurement_period
$ / shares
shares
Dec. 31, 2021
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award                  
Common stock, shares authorized (in shares) | shares   400,000,000       400,000,000   400,000,000 400,000,000
Common stock, par value (in dollars per share) | $ / shares   $ 0.01       $ 0.01   $ 0.01 $ 0.01
Preferred stock, authorized (in shares) | shares   100,000,000       100,000,000   100,000,000  
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.01       $ 0.01   $ 0.01  
Common stock aggregate offering price, remaining           $ 219,400,000      
Issuance of common stock, net of issuance costs (in shares) | shares       1,084,294     1,790,818    
Weighted average offering price (per share) | $ / shares       $ 64.21     $ 61.84    
Net proceeds of common share issuance           $ 2,059,000 $ 112,613,000    
Shares repurchase program, authorized repurchase amount (in shares) | shares   3,000,000       3,000,000   3,000,000  
Compensation costs   $ 800,000   $ 700,000   $ 800,000      
Common Shares Held in Deferred Compensation Plan                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Deposits to deferred compensation plan (in shares) | shares   3,582 147,285 5,181 131,322 150,867 136,503    
2019 Plan                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Common stock, shares authorized (in shares) | shares   1,898,961       1,898,961   1,898,961  
Granted (in shares) | shares 10,362                
Grant date fair value per share of restricted stock awards (in dollars per share) | $ / shares $ 63.70                
Remaining balance of shares available (in shares) | shares   819,008       819,008   819,008  
Long Term Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Number of measurement periods | measurement_period   3       3   3  
Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Granted (in shares) | shares           53,287      
Grant date fair value per share of restricted stock awards (in dollars per share) | $ / shares           $ 72.69      
Compensation costs           $ 2,200,000 $ 1,300,000    
Fair value of the restricted stock granted           3,900,000      
Unrecognized compensation costs related to restricted stock issuances   $ 10,700,000       $ 10,700,000   $ 10,700,000  
Remaining weighted average period           2 years 9 months 18 days      
Minimum | Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Grant date fair value per share of restricted stock awards (in dollars per share) | $ / shares               $ 14.20  
Vesting period for the restricted stock           1 year      
Maximum | Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Grant date fair value per share of restricted stock awards (in dollars per share) | $ / shares               $ 78.33  
Vesting period for the restricted stock           5 years      
At The Market Program                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Net proceeds of common share issuance       $ 68,600,000     109,100,000    
Total compensation to the applicable sales agents       $ 1,000,000     $ 1,600,000    
$300 Million ATM Program                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Common stock aggregate offering price   $ 300,000,000       $ 300,000,000      
Issuance of common stock, net of issuance costs (in shares) | shares   27,087       27,087      
Weighted average offering price (per share) | $ / shares   $ 76.03       $ 76.03      
Net proceeds of common share issuance           $ 2,000,000      
Total compensation to the applicable sales agents   $ 29,000       $ 29,000