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CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Allowance for doubtful accounts $ 22,943,000 $ 22,587,000
Accumulated depreciation 255,680,000 243,005,000
Finite-Lived Intangible Assets, Accumulated Amortization 170,613 138,374
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 18,238,000 $ 182,041,000
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) 14,533,247 20,763,021
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) 58,781,758 58,597,380
Common stock, shares outstanding (in shares) 48,587,942 42,173,790
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