Balance Sheet Parentheticals (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts Receivable, Current	$ 12,774	$ 14,120
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Common Stock, Par or Stated Value Per Share	$ 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	29,945,248	30,410,006
Treasury Stock, Shares	14,480,763	14,376,005