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Consolidated Balance Sheet (Parentheticals) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 4,364 $ 3,892
Accumulated depreciation of property and equipment 460,963 410,243
Accumulated amortization of intangible assets 161,371 204,853
Accumulated amortization of other assets $ 52,458 $ 46,788
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 62,955,214 62,775,762
Treasury stock, shares 10,645,079 8,554,908