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Common Shares (Activity Under ATM Share Offering Program) (Details) (USD $) In Thousands, except Share data in Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2011 | Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 2010 ATM Program [Member] | Jun. 30, 2011 2010 ATM Program [Member] | Jun. 30, 2011 2011 ATM Program [Member]
Common shares sold | 0.5 |  |  | 0.2 | 0.3 | 0.4
Total net consideration | $ 32,400 | $ 37,126 | $ 106,422 | $ 10,000 | $ 13,800 | $ 23,300
Average price per share |  |  |  | $ 56.50 | $ 55.81 | $ 64.52

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- Definition Value 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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