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CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Allowance for doubtful accounts $ 23,061,000 $ 22,007,000
Accumulated depreciation 268,723,000 259,126,000
Finite-Lived Intangible Assets, Accumulated Amortization 200,755 178,813
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 15,291,000 $ 17,278,000
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 20,000,000 20,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Treasury stock, shares (in shares) 15,400,907 14,545,715
Common Stock [Member]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 210,000,000 210,000,000
Common stock, shares, issued (in shares) 59,033,859 58,817,781
Common stock, shares outstanding (in shares) 47,972,383 48,611,497
Common Class B [Member]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 20,000,000 20,000,000
Common stock, shares, issued (in shares) 4,339,431 4,339,431
Common stock, shares outstanding (in shares) 0 0