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SHAREHOLDERS' EQUITY (DETAILS 4) (Common Shares [Member], USD $)
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12 Months Ended | 3 Months Ended | 12 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2011
Open Market [Member]
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Dec. 31, 2010
Open Market [Member]
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Dec. 31, 2009
Open Market [Member]
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Dec. 31, 2011
From Employees [Member]
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Dec. 31, 2010
From Employees [Member]
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Dec. 31, 2009
From Employees [Member]
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Dec. 31, 2011
Founding Shareholder [Member]
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Dec. 31, 2010
Founding Shareholder [Member]
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Dec. 31, 2009
Founding Shareholder [Member]
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Dec. 31, 2010
Founding Shareholder [Member]
Trident [Member]
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Dec. 31, 2011
2007 Plan [Member]
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Dec. 31, 2011
2009 Plan [Member]
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Dec. 31, 2011
2010 Plan [Member]
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| 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 | ||||