Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 48,572	$ 46,425
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	131,087,980	131,233,308
Common stock, shares outstanding	131,087,980	131,233,308
Select
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares issued	100	100
Common stock, shares outstanding	100	100