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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 4,274 $ 4,469
Accumulated depreciation of property and equipment 536,675 532,631
Accumulated amortization of intangible assets 187,609 185,054
Accumulated amortization of other assets $ 63,858 $ 62,349
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 63,818,035 63,779,009
Treasury stock, shares 13,269,513 12,631,125