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Balance Sheet Parenthetical (Parentheticals) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Allowance for doubtful accounts receivable $ 26,219 $ 24,287
Accumulated depreciation of property and equipment 382,965 373,180
Accumulated amortization of intangible assets 201,801 190,920
Accumulated amortization of other assets $ 43,530 $ 50,821
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 62,563,955 59,897,309
Treasury Stock, shares 8,083,716 8,077,311