Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangibles - Other intangible assets (Details)

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Goodwill and Other Intangibles - Other intangible assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other intangible assets      
Gross definite-lived intangible assets $ 20,932 $ 19,472  
Accumulated amortization (18,683) (17,892)  
Net definite-lived intangible assets 2,249 1,580  
Indefinite-lived intangible assets not subject to amortization 407 407  
Other intangible assets, net 2,656 1,987  
Amortization expense $ 795 $ 1,026 $ 1,166