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Common Shares (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2017 | Nov. 30, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 16, 2018 | May 05, 2017 | Sep. 23, 2016 | Aug. 31, 2015
Treasury Stock, Shares |  |  | 10,073,000 | 10,330,000 |  |  |  |  |
Treasury Stock, Value |  |  | $ 364,066 | $ 373,339 |  |  |  |  |
Number of common and preferred stock authorized to issue |  |  | 185,000,000 |  |  |  |  |  |
Common shares, authorized |  |  | 175,000,000 | 175,000,000 |  |  |  |  |
Preferred shares, authorized |  |  | 10,000,000 |  |  |  |  |  |
Common Stock, Shares, Outstanding |  |  | 92,700,000 |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  | 0 |  |  |  |  |  |
Common shares issued |  |  | 4,778 | 0 | 0 |  |  |  |
Proceeds from issuance of common shares |  |  | $ 445,038 | $ 0 | $ 0 |  |  |  |
Special Dividend, Per Share |  |  |  |  |  |  |  | $ 4.25 |
2017 ATM program [Member] |  |  |  |  |  |  |  |  |
Maximum aggregate offering price of common shares | $ 315,300 |  |  |  |  |  |  |  |
2014 ATM program [Member] |  |  |  |  |  |  |  |  |
Maximum aggregate offering price of common shares |  | $ 331,300 |  |  |  |  |  |  |
Maximum aggregate offering price of remaining common shares available for sale |  |  |  |  |  |  | $ 315,300 |  |
Common shares issued |  |  | 28,100 |  |  |  |  |  |
Subsequent Event [Member] | 2017 ATM program [Member] |  |  |  |  |  |  |  |  |
Maximum aggregate offering price of remaining common shares available for sale |  |  |  |  |  | $ 312,800 |  |  |
April 2007 Repurchase Plan [Member] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 500,000 |  |  |  |  |  |
April 2007 Repurchase Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  | $ 269,800 |  |  |
2017 equity offering [Member] |  |  |  |  |  |  |  |  |
Common shares issued |  |  | 4,800,000 |  |  |  |  |  |
Proceeds from issuance of common shares |  |  | $ 442,500 |  |  |  |  |  |
Unsecured Credit Facility [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | $ 600,000 |  |  |  |  |  | $ 500,000

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