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Common Shares (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 29, 2016 | Nov. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2016 | Dec. 31, 2015
Treasury Stock, Shares Repurchased |  |  |  | 10,346,000 | 10,703,000
Treasury Stock, Value of Shares Repurchased |  |  |  | $ 373,914 | $ 386,793
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 |  |  |  | 87,400,000 |
Preferred Stock, Shares Outstanding |  |  |  | 0 |
2014 ATM program [Member] |  |  |  |  |
Maximum aggregate offering price of common shares |  | $ 331,300 |  |  |
Common shares issued |  |  | 0 | 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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