Goodwill and Other Intangibles - Segment (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Goodwill
Balance at the beginning of the period	$ 11,054
Balance at the end of the period	10,788
European Operations
Goodwill
Balance at the beginning of the period	11,054
Currency translation adjustment	(266)
Balance at the end of the period	$ 10,788