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Common Shares (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands |  | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 04, 2020 | May 31, 2017 | Jun. 30, 2020 | Jun. 30, 2019 | Jul. 31, 2020 | Dec. 31, 2019
Number of common and preferred stock authorized to issue |  |  | 185,000 |  |  |
Common shares, authorized |  |  | 175,000 |  |  | 175,000
Preferred shares, authorized |  |  | 10,000 |  |  |
Common Stock, Shares, Outstanding |  |  | 97,400 |  |  |
Preferred Stock, Shares Outstanding |  |  | 0 |  |  |
Proceeds from issuance of common shares |  |  | $ 0 | $ 328,374 |  |
Unsecured Credit Facility [Member] |  |  |  |  |  |
Maximum borrowing capacity under unsecured credit facility |  |  | 900,000 |  |  |
2017 ATM program [Member] |  |  |  |  |  |
Maximum aggregate offering price of common shares | $ 362,700 |  |  |  |  |
2017 ATM program [Member] | Subsequent Event [Member] |  |  |  |  |  |
Maximum aggregate offering price of remaining common shares available for sale |  |  |  |  | $ 362,700 |
2017 ATM program [Member] |  |  |  |  |  |
Maximum aggregate offering price of common shares |  | $ 315,300 |  |  |  |
2017 ATM program [Member] | Subsequent Event [Member] |  |  |  |  |  |
Maximum aggregate offering price of remaining common shares available for sale |  |  |  |  | 287,700 |
April 2007 Repurchase Plan [Member] |  |  |  |  |  |
Treasury stock allowed for repurchase |  |  | $ 500,000 |  |  |
April 2007 Repurchase Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |
Share Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  | $ 269,500 |

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