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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) (Parenthetical) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) [Abstract]
Depreciation and amortization	$ 49,913	$ 52,174	$ 100,978	$ 104,207
Non-cash stock-based compensation expense	$ 4,555	$ 5,105	$ 9,095	$ 9,976

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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