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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 4,604 $ 5,926
Accumulated depreciation of property and equipment 512,831 490,429
Accumulated amortization of intangible assets 177,693 175,210
Accumulated amortization of other assets $ 59,408 $ 55,710
Preferred stock, par value per share $ 0.02 $ 0.02
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Common stock, par value per share $ 0.02 $ 0.02
Common stock, shares authorized 90,000,000 90,000,000
Common stock, shares issued 63,451,545 63,366,010
Treasury stock, shares 10,629,291 10,631,961