STOCK INCENTIVE PLANS (Details 2) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
STOCK INCENTIVE PLANS
Total compensation expense related to stock incentive plans	$ 16,300,000	$ 18,400,000	$ 19,000,000
Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award
Stock award distribution ratio	one for one basis
Award vesting period, low end of range (in years)	three years
Award vesting period, high end of range (in years)	six years
Portion of stock awards granted that are subject to total shareholder return conditions (as a percent)	38.00%	18.00%
Unrecorded compensation cost	33,600,000
Weighted-average remaining contractual life of outstanding stock awards (in years)	2.1
Stock awards unit activity
Outstanding units at the beginning of the period (in shares)	3,158,335	3,303,137	3,342,414
Units Granted (in shares)	357,791	1,344,084	285,470
Units Paid (in shares)	(406,711)	(1,277,284)	(280,858)
Units Canceled (in shares)	(218,117)	(211,602)	(43,889)
Outstanding units at the end of the period (in shares)	2,891,298	3,158,335	3,303,137
Aggregate intrinsic value at year end of outstanding awards	$ 86,970,000	$ 103,503,000	$ 97,938,000

Represents the ratio for distribution of stock awards in the form of shares of the company's common stock.

No definition available.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to equity instruments other than options outstanding under the plan as of the balance sheet date.

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Represents the percentage of stock awards granted during the period that are subject to the degree to which specified total shareholder return conditions are required to be satisfied before awards vest.

+ References

No definition available.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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The maximum vesting term over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition.

+ References

No definition available.

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The minimum vesting term over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition.

+ References

No definition available.

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- Definition

Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

+ References

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average period between the balance sheet date and expiration for equity-based awards other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan), which may be expressed in a decimal value for number of years.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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