Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Consolidated Balance Sheets [Abstract]
Allowance for accounts receivable	$ 1,395	$ 1,568
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	99,608,000	109,754,000
Common stock, shares outstanding	99,608,000	109,754,000