STOCK-BASED COMPENSATION AND OTHER STOCK-BASED PAYMENTS (Details 2) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Option Activity - Shares
Outstanding at December 31, 2011 (in shares)	197,238
Exercised (in shares)	(126,237)
Expired (in shares)	0
Outstanding at December 31, 2012 (in shares)	71,001	197,238
Stock Option Activity - Weighted Average Exercise Price
Outstanding at December 31, 2011 (in dollars per share)	$ 20.71
Exercised (in dollars per share)	$ 21.26
Expired (in dollars per share)	$ 0.00
Outstanding at December 31, 2012 (in dollars per share)	$ 19.73	$ 20.71
Stock Option Activity - Weighted Average Remaining Contractual Term
Outstanding at December 31 (in years)	1 year 4 months	2 years 4 months
Stock Option Activity - Aggregate Intrinsic Value (000's)
Outstanding at December 31	$ 42,647,000	$ 88,166,000
Intrinsic value of stock options exercised	$ 75,200,000	$ 77,100,000	$ 74,800,000

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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