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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 |  |  |

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