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CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts $ 26,220     $ 25,443        
Accumulated depreciation 294,638     268,415        
Finite-Lived Intangible Assets, Accumulated Amortization 323,887     280,442        
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 92,343     $ 8,876        
Treasury stock, shares (in shares) 21,859,301 21,859,194 21,848,336 21,850,356 21,849,933 21,154,343 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) 67,562,621 67,562,199 59,381,958 59,308,018 59,294,497 59,292,704 59,271,892 59,157,696
Common stock, shares outstanding (in shares) 50,042,751     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 4,339,431 4,339,431 4,339,431 4,339,431
Common stock, shares outstanding (in shares) 0     0