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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Property and equipment, accumulated depreciation $ 100,963 $ 96,137
Intangible assets, accumulated amortization $ 12,649 $ 7,044
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) 36,831,298 36,638,021
Common stock, outstanding (shares) 32,442,719 32,284,051
Treasury stock at cost (shares) 4,388,579 4,353,970