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CONSOLIDATED BALANCE SHEETS CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Allowance for doubtful accounts $ 24,468 $ 21,313
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 9,243 $ 14,224
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 20,000,000 20,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Treasury stock, shares outstanding 18,391,042 16,375,653
Common Stock    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 210,000,000 210,000,000
Common stock, shares issued 59,157,696 59,045,762
Common stock, shares outstanding 45,106,085 47,009,540
Common Class B    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 20,000,000 20,000,000
Common stock, shares issued 4,339,431 4,339,431
Common stock, shares outstanding 0 0