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Equity - Additional Information (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 15, 2019 | Sep. 03, 2019 | Jan. 29, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 28, 2018
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  | 14,375,000 | 11,500,000 |  |  | 7,187,500 |  |
Net proceeds from issuance of common stock |  |  |  |  | $ 450,710,000 | $ 142,601,000 | $ 302,000 |
Outstanding for future offerings, amount |  |  |  | $ 117,000,000 |  | 117,000,000 |  |
Issuance of common stock |  | $ 228,000,000 | $ 177,000,000 |  | 442,172,000 | 142,228,000 |  |
Share-based compensation, vesting period (in years) | 2 years |  |  |  |  |  |  |
Direct stock purchase and dividend reinvestment plan |  |  |  |  | 6,307,000 | $ 1,706,000 |  |
Share Repurchase Plan, February 2018 |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  | $ 100,000,000
Stock repurchase program, remaining authorized repurchase amount |  |  |  |  | $ 100,000,000 |  |  |
Convertible debt securities |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Securities excluded in the calculation of diluted earnings per share |  |  |  |  | 0 | 0 | 0 |
Equity awards |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Securities excluded in the calculation of diluted earnings per share |  |  |  |  | 10,051 | 7,230 | 5,843 |
ATM Offerings | Common Stock |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Aggregate value of common stock issuable |  |  |  | $ 150,000,000 |  | $ 150,000,000 |  |
Issuance of common stock (in shares) |  |  |  | 1,550,819 | 2,259,758 |  |  |
Net proceeds from issuance of common stock |  |  |  |  | $ 36,000,000 | $ 25,000,000 |  |
Outstanding for future offerings, amount |  |  |  |  | $ 88,000,000 |  |  |
Common Stock |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  |  | 28,724,645 | 8,738,319 |  |
Issuance of common stock |  |  |  |  | $ 288,000 | $ 88,000 |  |
Direct stock purchase and dividend reinvestment plan (in shares) |  |  |  |  | 399,838 | 113,004 |  |
Direct stock purchase and dividend reinvestment plan |  |  |  |  | $ 4,000 | $ 1,000 |  |
CoreVest LLC |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Restricted stock awards (in shares) | 588,260 |  |  |  |  |  |  |
Shares issued (in usd per share) | $ 16.48 |  |  |  |  |  |  |
Restricted stock awards | $ 10,000,000 |  |  |  |  |  |  |

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