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CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Allowance for doubtful accounts $ 22,763,000 $ 21,313,000
Accumulated depreciation 285,632,000 278,455,000
Finite-Lived Intangible Assets, Accumulated Amortization 237,716 223,554
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 11,441,000 $ 14,224,000
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) 16,384,969 16,375,653
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) 59,144,569 59,045,762
Common stock, shares outstanding (in shares) 47,099,031 47,009,540
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