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Shareholders' Equity - Additional Information (Details) - USD ($) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jul. 12, 2019 | Feb. 14, 2018 | Nov. 09, 2017
Class of Stock [Line Items] |  |  |  |  |
Minimum % of REIT taxable income to be paid as dividend annually | 90.00% |  |  |  |
Prospectus Supplement |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Maximum common stock value authorized under prospectus supplement |  |  |  |  | $ 150,000,000
Shares sold (in shares) | 0 | 0 |  |  |
Amended Credit Agreement |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 100,000.0 |  |  |  |
Line of Credit | Revolving Credit Facility | Amended Credit Agreement |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  | $ 900,000,000.0 | $ 900,000,000.0 |
Common shares | February 2018 Stock Buyback Program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  | $ 200,000,000.0 |
Purchase of treasury shares (in shares) | 553,665 |  |  |  |

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