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STOCK-BASED COMPENSATION (Details) (USD $)	3 Months Ended		6 Months Ended
STOCK-BASED COMPENSATION (Details) (USD $)	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Information related to share based awards
Total stock-based compensation expense	$ 4,200,000	$ 7,000,000	$ 9,900,000	$ 11,700,000
Deferred income tax benefit	1,700,000	2,800,000	4,000,000	4,700,000
Stock-based compensation cost capitalized	0	0	0	0
Stock Options
Information related to share based awards
Total stock-based compensation expense	500,000	600,000	900,000	1,000,000
Performance Stock Rights
Information related to share based awards
Total stock-based compensation expense	1,000,000	3,100,000	3,200,000	4,300,000
Restricted Share Units
Information related to share based awards
Total stock-based compensation expense	2,500,000	3,300,000	5,300,000	5,400,000
Nonemployee Director Deferred Stock Units
Information related to share based awards
Total stock-based compensation expense	$ 200,000	$ 0	$ 500,000	$ 1,000,000

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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