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Common Shares (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
May 05, 2017 | Nov. 30, 2014 | Mar. 31, 2017 | Dec. 31, 2016
Treasury Stock, Shares Repurchased |  |  | 10,125,000 | 10,330,000
Treasury Stock, Value of Shares Repurchased |  |  | $ 365,923 | $ 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 |  |  | 87,600,000 |
Preferred Stock, Shares Outstanding |  |  | 0 |
2014 ATM program [Member] |  |  |  |
Maximum aggregate offering price of common shares |  | $ 331,300 |  |
Common shares issued |  |  | 0 |
2014 ATM program [Member] | Subsequent Event [Member] |  |  |  |
Maximum aggregate offering price of remaining common shares available for sale | $ 315,300 |  |  |
Common shares issued | 0 |  |  |
April 2007 Repurchase Plan [Member] |  |  |  |
Treasury stock allowed for repurchase |  |  | $ 500,000 |
Treasury Stock, Shares Repurchased |  |  | 4,300,000 |
Treasury Stock, Value of Shares Repurchased |  |  | $ 230,200 |
April 2007 Repurchase Plan [Member] | Subsequent Event [Member] |  |  |  |
Share Repurchase Program, Remaining Authorized Repurchase Amount | $ 269,800 |  |  |

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