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CONSOLIDATED BALANCE SHEETS CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Allowance for doubtful accounts $ 22,007 $ 22,587
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 770 $ 164,342
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 14,545,715 20,763,021
Common Stock    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 210,000,000 210,000,000
Common stock, shares issued 58,817,781 58,597,380
Common stock, shares outstanding 48,611,497 42,173,790
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