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CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Allowance for doubtful accounts $ 25,821,000 $ 24,468,000
Accumulated depreciation 293,076,000 291,811,000
Finite-Lived Intangible Assets, Accumulated Amortization 271,598 249,539
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 7,773,000 $ 9,243,000
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) 21,154,343 18,391,042
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) 59,292,704 59,157,696
Common stock, shares outstanding (in shares) 42,477,792 45,106,085
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