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Balance Sheet Parenthetical (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Allowance for doubtful accounts receivable $ 3,967 $ 27,938
Accumulated depreciation of property and equipment 411,616 410,243
Accumulated amortization of intangible assets 201,810 204,853
Accumulated amortization of other assets $ 47,941 $ 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 62,853,785 62,775,762
Treasury Stock, shares 10,648,096 8,554,908