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Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 10,903 $ 10,462
Accumulated depreciation and amortization of property and equipment 273,379 331,700
Accumulated amortization of intangible assets $ 56,255 $ 52,942
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 35,762,000 35,482,000
Common stock, shares outstanding 35,762,000 35,482,000