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Equity - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Feb. 28, 2018
Stockholders Equity Note [Line Items] |  |  |  |  |
Net proceeds from issuance of common stock |  |  | $ 20,248,000 | $ 5,791,000 |
Share Repurchase Plan, February 2018 |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Common stock authorized to repurchase by Board |  |  |  |  | $ 100,000,000
Share repurchases (in shares) |  |  | 0 |  |
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) |  |  |  | 32,200,000 |
Equity awards |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Securities excluded in the calculation of diluted earnings per share (in shares) | 22,102 | 13,560 | 18,736 | 15,457 |
At The Market Offerings | Common Stock |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Stock issuance program, authorized amount | $ 175,000,000 |  | $ 175,000,000 |  |
Issuance of common stock (in shares) |  |  | 1,466,669 |  |
Net proceeds from issuance of common stock |  |  | $ 18,000,000 |  |
Remaining capacity | $ 92,000,000 |  | 92,000,000 |  |
Direct Stock Purchases and Dividend Reinvestment Plan | Common Stock |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Net proceeds from issuance of common stock |  |  | $ 1,000,000 |  |
Shares remaining for future offerings | 6,000,000 |  | 6,000,000 |  |
Common Stock |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Issuance of common stock (in shares) | 1,585,709 |  | 2,391,777 | 350,088 |
Direct stock purchase and dividend reinvestment plan (in shares) |  |  | 119,040 | 119,040 |
Share repurchases (in shares) |  | 3,047,335 |  | 3,047,335 |

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