Balance Sheet Parentheticals (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts Receivable, Current	$ 17,028	$ 14,856
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	27,699,352	28,243,007
Treasury Stock, Shares	17,086,659	16,543,004