Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Allowance for doubtful accounts	$ 12,317	$ 11,536
Shareholders’ equity:
Preferred Stock, Par Value	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Common Stock, Par Value	$ 0.01	$ 0.01
Common Stock, Shares Authorized	125,000,000	125,000,000
Common Stock, Shares Issued	44,786,011	44,786,011
Common Stock, Shares Outstanding	31,590,101	32,425,315
Treasury Stock	13,195,910	12,360,696