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STOCK-BASED COMPENSATION - Stock-based employee compensation expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Disclosure Of Compensation Related Costs, Share-Based Payments
Pre-tax expense	$ 2,002	$ 1,602	$ 5,904	$ 5,423
After tax expense	$ 1,271	$ 1,017	$ 3,749	$ 3,444

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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