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CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts $ 24,590   $ 25,443      
Accumulated depreciation 278,916   268,415      
Finite-Lived Intangible Assets, Accumulated Amortization 292,928   280,442      
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 96,322   $ 8,876      
Treasury stock, shares (in shares) 21,859,194 21,848,336 21,850,356 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) 67,562,199 59,381,958 59,308,018 59,292,704 59,271,892 59,157,696
Common stock, shares outstanding (in shares) 50,042,436   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
Common stock, shares outstanding (in shares) 0   0