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CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss, Current $ 28,333 $ 23,909
Accumulated depreciation 323,819 312,106
Finite-Lived Intangible Assets, Accumulated Amortization 284,456 261,424
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 83,627 $ 87,142
Treasury stock, shares (in shares) 21,886,291 21,870,961
5.375% Senior Notes due 2021    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   $ 1,039
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) 67,726,867 67,596,515
Common stock, shares outstanding (in shares) 50,180,007 50,064,985
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