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Common Shares (Narrative) (Details) (USD $) | 1 Months Ended | 12 Months Ended | 57 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 2 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2008 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 | Mar. 31, 2010 2010 ATM Program [Member] | Dec. 31, 2011 2010 ATM Program [Member] | Dec. 31, 2010 2010 ATM Program [Member] | Jan. 31, 2012 2011 ATM Program [Member] | May 31, 2011 2011 ATM Program [Member] | Feb. 17, 2012 2011 ATM Program [Member] | Dec. 31, 2011 2011 ATM Program [Member] | Jan. 31, 2012 Issuance of Equity [Member]
Activity Under Share Offering Program [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchase program, authorized amount | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period, shares |  |  |  |  | 4,300,000 |  |  |  |  |  |  |  |
Stock repurchased during period, value |  |  |  | (6,000) | 230,200,000 |  |  |  |  |  |  |  |
Remaining dollar value of securities authorized to be repurchased |  | 269,800,000 |  |  |  |  |  |  |  |  |  |  |
Maximum aggregate offering price of common shares |  |  |  |  |  | 250,000,000 |  |  |  | 300,000,000 |  |  |
Common shares sold |  |  |  |  |  |  | 252,500 | 4,867,700 | 100,000 |  | 0 | 1,498,500 | 6,612,500
Average price per share |  |  |  |  |  |  | $ 55.81 | $ 48.37 | $ 62.41 |  | $ 0.00 | $ 62.98 |
Total net consideration |  | 106,571,000 | 231,651,000 | 272,112,000 |  |  | 13,847,000 | 231,650,500 | 3,200,000 |  | 0 | 92,723,600 | 391,600,000
Maximum aggregate offering price of remaining common shares available for sale |  |  |  |  |  |  |  |  |  |  |  | $ 202,400,000 |
Number of common and preferred stock authorized to issue |  | 110,000,000 |  |  | 110,000,000 |  |  |  |  |  |  |  |
Common shares, authorized |  | 100,000,000 | 100,000,000 |  | 100,000,000 |  |  |  |  |  |  |  |
Preferred shares, authorized |  | 10,000,000 |  |  | 10,000,000 |  |  |  |  |  |  |  |
Common shares, outstanding |  | 72,000,000 |  |  | 72,000,000 |  |  |  |  |  |  |  |
Preferred shares, outstanding |  | 0 |  |  | 0 |  |  |  |  |  |  |  |
Common shares available for sale |  | 100,000,000 | 100,000,000 |  | 100,000,000 |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  | 80.00% |  |  | 80.00% |  |  |  |  |  |  |  |

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