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Equity - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2018 | Feb. 28, 2018
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Net proceeds from issuance of common stock |  |  | $ 5,791,000 | $ 426,970,000 |  |  |
Direct stock purchase and dividend reinvestment plan |  |  |  | $ 6,307,000 |  |  |
Common stock repurchased, amount | $ 21,659,000 |  | 21,659,000 |  |  |  |
Share Repurchase Plan, February 2018 |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Common stock authorized to repurchase by Board |  |  |  |  |  |  | $ 100,000,000
Common stock repurchased (in shares) | 3,047,335 |  |  |  |  |  |
Common stock repurchased, amount | $ 22,000,000 |  |  |  |  |  |
Available authorization remaining for repurchase | $ 78,000,000 |  | $ 78,000,000 |  |  |  |
Convertible Debt Securities |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Securities excluded in the calculation of diluted earnings per share (in shares) |  |  | 32,225,825 |  |  |  |
Equity awards |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Securities excluded in the calculation of diluted earnings per share (in shares) | 13,560 | 11,710 | 15,457 | 9,361 |  |  |
At The Market Offerings | Common Stock |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Stock issuance program, authorized amount |  |  |  |  | $ 175,000,000 | $ 150,000,000 |
Issuance of common stock (in shares) |  |  | 129,500 |  |  |  |
Net proceeds from issuance of common stock |  |  | $ 2,000,000 |  |  |  |
Remaining outstanding | $ 110,000,000 |  | $ 110,000,000 |  |  |  |
Common Stock |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Issuance of common stock (in shares) |  | 14,375,000 | 350,088 | 26,666,191 |  |  |
Direct stock purchase and dividend reinvestment plan (in shares) |  |  | 0 | 399,838 |  |  |
Direct stock purchase and dividend reinvestment plan |  |  |  | $ 4,000 |  |  |
Common stock repurchased (in shares) | 3,047,335 |  | 3,047,335 |  |  |  |
Common stock repurchased, amount | $ 30,000 |  | $ 30,000 |  |  |  |

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