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STOCK COMPENSATION Total Stock Based Compensation Expense and the Tax Related Benefit (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
STOCK COMPENSATION [Abstract]
Stock option expense	$ 3,027	$ 2,833	$ 8,706	$ 8,206
RSU expense	2,839	2,204	7,480	6,551
Total stock based compensation expense	5,866	5,037	16,186	14,757
Total related tax benefit	$ 1,692	$ 1,430	$ 4,406	$ 4,302

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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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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