Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 41,255	$ 41,854
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	700,000,000	700,000,000
Common stock, shares issued	139,546,090	140,589,256
Common stock, shares outstanding	139,546,090	140,589,256
Select
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 41,255	$ 41,854
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares issued	100	100
Common stock, shares outstanding	100	100