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Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Other intangible assets:    
Indefinite-lived trademarks $ 9,052 $ 9,052
Patents 18,154 18,154
Total other intangible assets, gross 27,206 27,206
Accumulated amortization - patents (17,100) (16,631)
Other intangible assets, net $ 10,106 $ 10,575
Patents | Minimum    
Other intangible assets:    
Estimated Useful Life (in years) 8 years  
Patents | Maximum [Member]    
Other intangible assets:    
Estimated Useful Life (in years) 16 years