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STOCK-BASED COMPENSATION - Stock-based employee compensation expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Disclosure Of Compensation Related Costs, Share-Based Payments
Pre-tax expense	$ 2,001	$ 1,606	$ 3,902	$ 3,821
After tax expense	$ 1,271	$ 1,019	$ 2,478	$ 2,426

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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