Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets and Goodwill (Intangible Assets Rollforward) (Details)

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Intangible Assets and Goodwill (Intangible Assets Rollforward) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Finite-lived Intangible Assets [Roll Forward]        
Balance, beginning of period     $ 6,295  
Amortization expense $ (512) $ (528) (1,559) $ (1,568)
Currency translation     75  
Balance, end of period $ 4,661   $ 4,661