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Common Shares (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2017 | Feb. 18, 2021 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Treasury Stock, Shares, Acquired |  |  |  |  |  | 3,222
Treasury Stock, Value, Acquired, Par Value Method |  |  |  |  |  | $ (253)
Number of common and preferred stock authorized to issue |  |  | 185,000,000 | 185,000,000 |  |
Common shares, authorized |  |  | 175,000,000 | 175,000,000 | 175,000,000 |
Preferred shares, authorized |  |  | 10,000,000 | 10,000,000 |  |
Common Stock, Shares, Outstanding |  |  | 97,400,000 | 97,400,000 |  |
Preferred Stock, Shares Outstanding |  |  | 0 | 0 |  |
Common shares issued |  |  |  | 0 | 3,599 | 0
Proceeds from issuance of common shares |  |  |  | $ 0 | $ 353,213 | $ 0
Cash distributions declared to equity holders per share |  |  | $ 3.32 | $ 3.32 | $ 3.20 | $ 3.08
2020 ATM program [Member] |  |  |  |  |  |
Maximum aggregate offering price of common shares |  |  |  | $ 362,700 |  |
2017 ATM program [Member] |  |  |  |  |  |
Maximum aggregate offering price of common shares | $ 315,300 |  |  |  |  |
Common shares issued |  |  |  |  | 200,000 |
2019 Equity Offering [Member] |  |  |  |  |  |
Common shares issued |  |  |  | 3,400,000 |  |
Proceeds from issuance of common shares |  |  |  | $ 328,400 |  |
Subsequent Event [Member] |  |  |  |  |  |
Cash distributions declared to equity holders per share |  | $ 0.83 |  |  |  |
Maximum aggregate offering price of remaining common shares available for sale |  | $ 362,700 |  |  |  |
April 2007 Repurchase Plan [Member] |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 500,000 | $ 500,000 |  |
April 2007 Repurchase Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 269,500 |  |  |  |

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