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Common Shares (Activity Under At-The-Market Share Offering Program) (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Total net consideration |  |  | $ 40,098,000 | $ 693,375,000
2012 ATM Program [Member] |  |  |  |
Total net consideration | 0 | 88,915,900 | 40,097,600 | 173,627,600
Common shares sold | 0 | 1,302,500 | 555,100 | 2,607,900
Average price per common share sold | $ 0.00 | $ 69.34 | $ 73.73 | $ 67.63
Maximum aggregate offering price of remaining common shares available for sale | 82,700,000 |  | 82,700,000 |
2010 and 2011 ATM Programs [Member] |  |  |  |
Total net consideration |  | $ 0 |  | $ 128,128,000
Common shares sold |  | 0 |  | 1,971,400
Average price per common share sold |  | $ 0.00 |  | $ 66.01

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- Definition Maximum aggregate offering price of common shares under the at-the-market share offering program available for sale. + References No definition available. + Details
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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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