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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) (Parenthetical) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Expense
Depreciation and amortization	$ 54,227	$ 54,070	$ 155,206	$ 158,277
Non-cash stock-based compensation expense	$ 5,221	$ 5,823	$ 14,316	$ 15,799

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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