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CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts $ 25,260 $ 25,443    
Accumulated depreciation 269,582 268,415    
Finite-Lived Intangible Assets, Accumulated Amortization 278,711 280,442    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 8,211 $ 8,876    
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) 21,848,336 21,850,356 18,756,498 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) 59,381,958 59,308,018 59,271,892 59,157,696
Common stock, shares outstanding (in shares) 41,873,053 41,797,093    
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 4,339,431 4,339,431