EQUITY-BASED COMPENSATION (Details) (USD $)	6 Months Ended
Jun. 30, 2011
Equity-based compensation
Number of shares authorized (in shares)	2,200,000
Restricted Stock
Restricted stock activity
Outstanding at the beginning of the period (in shares)	991,685
Granted (in shares)	316,600
Vested (in shares)	(155,700)
Forfeited (in shares)	(5,647)
Outstanding at the end of the period (in shares)	1,146,938
Weighted-Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 29.46
Granted (in dollars per share)	$ 22.60
Vested (in dollars per share)	$ 37.49
Forfeited (in dollars per share)	$ 27.48
Outstanding at the end of the period (in dollars per share)	$ 26.51
Stock Options
Stock options activity
Outstanding at the beginning of the period (in shares)	442,357
Exercised (in shares)	(34,900)
Forfeited (in shares)	(31,740)
Outstanding at the end of the period (in shares)	375,717
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 27.08
Exercised (in dollars per share)	$ 24.38
Forfeited (in dollars per share)	$ 25.84
Outstanding at the end of the period (in dollars per share)	$ 27.43
Weighted-Average Remaining Contractual Term (in years)
Options outstanding (in years)	1.6
Intrinsic Value
Options outstanding	$ 600

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

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The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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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 weighted average fair value at grant date for nonvested equity-based awards issued 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 fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

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

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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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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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Number of share options (or share units) exercised during the current period.

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