Unaudited Condensed Consolidated Balance Sheets Parenthetical (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 5,428	$ 4,793
Allowance For Notes Receivable Related Parties Noncurrent	$ 3,100	$ 3,100
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized (in shares)	2,000,000	2,000,000
Preferred Stock, Shares Issued (in shares)	0	0
Preferred Stock, Shares Outstanding (in shares)	0	0
Common Stock, Par or Stated Value Per Share (in dollares per share)	$ 0.01	$ 0.01
Common Stock, Shares Authorized (in shares)	90,000,000	90,000,000
Common Stock, Shares, Issued (in shares)	32,115,219	32,073,642
Treasury Stock, Shares (in shares)	216,695	208,157