Unaudited Condensed Consolidated Balance Sheets Parenthetical (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts Receivable, Current	$ 5,213	$ 4,793
Allowance For Notes Receivable Related Parties Noncurrent	$ 3,100	$ 3,100
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	2,000,000	2,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	90,000,000	90,000,000
Common Stock, Shares, Issued	32,103,501	32,073,642
Treasury Stock, Shares	216,695	208,157