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Stockholders' Equity - Narrative (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock, shares authorized (in shares) |  | 400,000,000 |  | 400,000,000 |  | 400,000,000
Common stock, par value (in dollars per share) |  | $ 0.01 |  | $ 0.01 |  | $ 0.01
Preferred stock, authorized (in shares) |  | 100,000,000 |  | 100,000,000 |  |
Preferred stock, par value (in dollars per share) |  | $ 0.01 |  | $ 0.01 |  |
Net proceeds of common share issuance |  |  |  | $ 191,018,000 | $ 107,991,000 |
Shares repurchase program, authorized repurchase amount (in shares) |  | 3,000,000 |  | 3,000,000 |  |
Repurchased shares of stock pursuant to share repurchase authorization (in shares) |  |  |  | 0 |  |
Common stock, shares issued (in shares) | 11,200 | 65,495,713 |  | 65,495,713 |  | 61,013,711
Grant date fair value per share (in dollars per share) | $ 44.65 |  |  |  |  |
Compensation costs |  | $ 500,000 |  | $ 500,000 |  |
2019 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock, shares authorized (in shares) | 1,898,961 | 1,898,961 |  | 1,898,961 |  |
Remaining balance of shares available (in shares) | 1,510,079 | 1,517,560 |  | 1,517,560 |  |
Amended and Restated 2010 Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Remaining balance of shares available (in shares) | 388,882 |  |  |  |  |
Long Term Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Issuance of common stock, net of issuance costs (in shares) |  |  |  | 196,087 |  |
Weighted average offering price per share (in dollars per share) |  |  |  | $ 36.55 |  |
Restricted stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation costs |  | $ 400,000 | $ 400,000 | $ 900,000 | 900,000 |
Grant date fair value per share of restricted stock awards (in dollars per share) |  |  |  | $ 40.29 |  |
Fair value of the restricted stock granted |  |  |  | $ 1,200,000 |  |
Vesting period for the restricted stock |  |  |  | 5 years |  |
Unrecognized compensation costs related to restricted stock issuances |  | $ 3,900,000 |  | $ 3,900,000 |  |
Remaining weighted average period |  |  |  | 2 years 10 months 24 days |  |
Minimum | Restricted stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Grant date fair value per share of restricted stock awards (in dollars per share) |  |  |  | $ 14.20 |  |
Maximum | Restricted stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Grant date fair value per share of restricted stock awards (in dollars per share) |  |  |  | $ 40.29 |  |
$300 Million ATM Program |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock aggregate offering price |  |  |  | $ 300,000,000.0 |  |
Common stock aggregate offering price, remaining |  |  |  | $ 235,900,000 |  |
Issuance of common stock, net of issuance costs (in shares) |  | 2,375,270 |  |  |  |
Shares issued, price per share (in dollars per share) |  | $ 45.76 |  | $ 45.76 |  |
$250 Million ATM Program |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock aggregate offering price |  |  |  |  | $ 250,000,000.0 |
Issuance of common stock, net of issuance costs (in shares) |  |  | 2,826,167 | 4,364,071 |  |
Shares issued, price per share (in dollars per share) |  | $ 43.77 | $ 37.48 | $ 43.77 | $ 37.48 |
$200 Million ATM Program |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock aggregate offering price |  |  |  |  | $ 200,000,000.0 |
Issuance of common stock, net of issuance costs (in shares) |  |  |  |  | 2,885,401 |
Shares issued, price per share (in dollars per share) |  |  | $ 37.43 |  | $ 37.43 |
$300 Million & $250 Million ATM Program |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Net proceeds of common share issuance |  | $ 107,100,000 |  | $ 188,200,000 |  |
Total compensation to the applicable sales agents |  | $ 1,600,000 |  | $ 2,800,000 |  |
$250 Million & $200 Million ATM Program |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Net proceeds of common share issuance |  |  | $ 104,400,000 |  | $ 106,400,000 |
Total compensation to the applicable sales agents |  |  | $ 1,500,000 |  | $ 1,600,000 |

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