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CONSOLIDATED BALANCE SHEETS CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Allowance for doubtful accounts $ 21,313 $ 22,007
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 14,224 $ 17,278
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 16,375,653 14,545,715
Common Stock    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 210,000,000 210,000,000
Common stock, shares issued 59,045,762 58,817,781
Common stock, shares outstanding 47,009,540 48,611,497
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