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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other assets noncurrent:    
Trademarks and other intangibles, accumulated amortization $ 15,326 $ 10,733
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 37,618,000 34,230,000
Treasury stock at cost, shares 1,387,000 1,356,000
Patents [Member]    
Shareholders' equity:    
Accumulated amortization $ 2,819 $ 2,702