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Common Shares (Activity Under At-The-Market Share Offering Program) (Details) (USD $) | 9 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 2012 ATM Program [Member] | Sep. 30, 2013 2012 ATM Program [Member] | Sep. 30, 2014 2012 ATM Program [Member] | Sep. 30, 2013 2012 ATM Program [Member] | Nov. 01, 2014 Subsequent Event [Member] 2012 ATM Program [Member] | Oct. 31, 2014 Subsequent Event [Member] 2012 ATM Program [Member]
Total net consideration | $ 50,535,000 | $ 40,098,000 | $ 50,535,300 | $ 0 | $ 50,535,300 | $ 40,097,600 |  |
Common shares sold |  |  | 688,300 | 0 | 688,300 | 555,100 | 0 |
Average price per share |  |  | $ 74.60 | $ 0.00 | $ 74.60 | $ 73.73 |  |
Maximum aggregate offering price of remaining common shares available for sale |  |  |  |  |  |  |  | $ 31,300,000

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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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