CONSOLIDATED BALANCE SHEETS Balance Sheet Parenthetical (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Condensed Consolidated Balance Sheet Parenthetical [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 23,660	$ 17,836
Preferred Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Preferred Stock, Shares Authorized	5,000,000	5,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Common Stock, Shares Authorized	125,000,000	125,000,000
Common Stock, Shares, Issued	70,784,560	70,711,439
Common Stock, Shares, Outstanding	68,202,040	68,128,919
Treasury Stock, Shares	2,582,520	2,582,520