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RETIREMENT EXPENSES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Stock-based compensation	$ 1,422	$ 969
Former President and Chief Executive Officer [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Expenses associated with management retirements	2,965
Stock-based compensation	$ 894

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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