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Common Shares (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 31, 2011 | Mar. 31, 2010 | Sep. 30, 2011 | Jun. 30, 2011 | Jun. 30, 2010 | Dec. 31, 2010
Common Shares |  |  |  |  |  |
Number of common and preferred stock authorized to issue |  |  |  | 110,000,000 |  |
Common shares, authorized |  |  |  | 100,000,000 |  | 100,000,000
Preferred shares authorized |  |  |  | 10,000,000 |  |
Common shares outstanding |  |  |  | 70,700,000 |  |
Preferred shares outstanding |  |  |  | 0 |  |
Maximum aggregate offering price of common shares | $ 300,000,000 | $ 250,000,000 |  |  |  |
Common shares sold |  |  | 500,000 |  |  |
Average price per common share issued |  |  | $ 65.77 |  |  |
Total net consideration |  |  | 32,400,000 | 37,126,000 | 106,422,000 |
Maximum aggregate offering price of remaining common shares available for sale |  |  | $ 243,300,000 |  |  |

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