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Common Shares (Activity Under At-The-Market Share Offering Program) (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Total net consideration |  |  | $ 40,182,000 | $ 604,459,000
2010 and 2011 ATM Programs [Member] |  |  |  |
Total net consideration |  | 83,836,300 |  | 128,128,000
Common shares sold |  | 1,267,100 |  | 1,971,400
Average price per common share sold |  | $ 67.19 |  | $ 66.01
2012 ATM Program [Member] |  |  |  |
Total net consideration | 30,816,200 | 84,711,800 | 40,181,700 | 84,711,800
Common shares sold | 419,300 | 1,305,500 | 555,100 | 1,305,500
Average price per common share sold | $ 74.74 | $ 65.93 | $ 73.73 | $ 65.93
Maximum aggregate offering price of remaining common shares available for sale | $ 82,700,000 |  | $ 82,700,000 |

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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: 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 4: 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=6959260&loc=d3e187085-122770 Reference 5: 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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