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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Property and equipment, accumulated depreciation $ 96,892 $ 95,472
Intangible assets, accumulated amortization $ 33,166 $ 33,050
Preferred stock, par value (usd per share) $ 0.001 $ 0.001
Preferred stock, authorized (shares) 5,000,000 5,000,000
Preferred stock, issued (shares) 0 0
Preferred stock, outstanding (shares) 0 0
Common stock, par value (usd per share) $ 0.001 $ 0.001
Common stock, authorized (shares) 60,000,000 60,000,000
Common stock, issued (shares) 36,337,743 36,252,280
Common stock, outstanding (shares) 32,037,667 31,973,505
Treasury stock at cost (shares) 4,300,076 4,278,775