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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement Of Financial Position [Abstract]    
Accounts receivable, allowance $ 973 $ 1,391
Accumulated depreciation [1] 83,404 47,267
Accumulated amortization $ 77,622 $ 53,965
Common Stock, par value
Common Stock, shares authorized 55,000,000 55,000,000
Common Stock, shares issued 36,761,362 36,534,464
Common Stock, shares outstanding 36,761,362 36,534,464
[1] Includes accumulated amortization of capital lease obligations.