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Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 12,610 $ 10,762
Accumulated depreciation and amortization of property and equipment 238,766 236,330
Accumulated amortization of intangible assets $ 83,187 $ 73,492
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 3,000,000 3,000,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 35,049,000 35,263,000
Common stock, shares outstanding 35,049,000 35,263,000