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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Other assets noncurrent:    
Accumulated amortization $ 10,572 $ 9,459
Shareholders' equity:    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 75,000,000 75,000,000
Common stock, shares issued 38,463,000 37,618,000
Treasury stock at cost, shares 1,484,000 1,387,000
Acquired Technology [Member]    
Other assets noncurrent:    
Accumulated amortization $ 16,815 $ 8,685