v2.4.0.6

SHAREHOLDERS' EQUITY (DETAILS 4) (Common Shares [Member], USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Open Market [Member] | Dec. 31, 2010 Open Market [Member] | Dec. 31, 2009 Open Market [Member] | Dec. 31, 2011 From Employees [Member] | Dec. 31, 2010 From Employees [Member] | Dec. 31, 2009 From Employees [Member] | Dec. 31, 2011 Founding Shareholder [Member] | Dec. 31, 2010 Founding Shareholder [Member] | Dec. 31, 2009 Founding Shareholder [Member] | Dec. 31, 2010 Founding Shareholder [Member] Trident [Member] | Dec. 31, 2011 2007 Plan [Member] | Dec. 31, 2011 2009 Plan [Member] | Dec. 31, 2011 2010 Plan [Member]
Treasury Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized amounts |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 | $ 500,000,000 | $ 750,000,000
Remaining authorized repurchase amount | 544,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares acquired | 2,052,000 | 22,194,000 | 6,082,000 | 1,609,000 | 18,750,000 | 5,851,000 | 443,000 | 381,000 | 231,000 | 0 | 3,063,000 | 0 | 3,062,864 |  |  |
Cost of shares acquired | $ 65,885,000 | $ 709,583,000 | $ 175,909,000 | $ 49,974,000 | $ 590,694,000 | $ 169,620,000 | $ 15,911,000 | $ 11,062,000 | $ 6,289,000 | $ 0 | $ 107,827,000 | $ 0 |  |  |  |
Average price of shares acquired | $ 32.11 | $ 31.97 | $ 28.92 | $ 31.07 | $ 31.50 | $ 28.99 | $ 35.92 | $ 29.04 | $ 27.23 | $ 0 | $ 35.21 | $ 0 |  |  |  |

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 1 -Section B -Paragraph 7 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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