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Equity - Additional Information (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 03, 2019 | Jan. 29, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Feb. 28, 2018
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Issuance of common stock (in shares) | 14,375,000 | 11,500,000 |  |  |  |  |  |
Net proceeds from issuance of common stock |  |  |  |  | $ 426,970,000 | $ 117,311,000 |  |
Issuance of common stock | $ 228,000,000 | $ 177,000,000 | $ 228,483,000 | $ 117,036,000 | 418,591,000 | $ 117,036,000 |  |
Direct stock purchase and dividend reinvestment plan |  |  |  |  | 6,307,000 |  |  |
Share Repurchase Plan, February 2018 |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Common stock authorized to repurchase by Board |  |  |  |  |  |  |  | $ 100,000,000
Available authorization remaining for repurchase |  |  | $ 100,000,000 |  | $ 100,000,000 |  |  |
Equity awards |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Securities excluded in the calculation of diluted earnings per share (in shares) |  |  | 11,710 | 7,761 | 9,361 | 7,230 |  |
At The Market Offerings | Common Stock |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Stock issuance program, authorized amount |  |  |  |  |  |  | $ 150,000,000 |
Issuance of common stock (in shares) |  |  |  |  | 791,191 |  |  |
Net proceeds from issuance of common stock |  |  |  |  | $ 13,000,000 |  |  |
Remaining outstanding |  |  | $ 112,000,000 |  | $ 112,000,000 |  |  |
Common Stock |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  | 14,375,000 | 7,187,500 | 26,666,191 | 7,187,500 |  |
Issuance of common stock |  |  | $ 144,000 | $ 72,000 | $ 267,000 | $ 72,000 |  |
Direct stock purchase and dividend reinvestment plan (in shares) |  |  |  |  | 399,838 |  |  |
Direct stock purchase and dividend reinvestment plan |  |  |  |  | $ 4,000 |  |  |

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