Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Balance	$ 61,888	$ 60,470	$ 2,520
Currency exchange rate adjustment	142	70	(407)
Goodwill, Purchase Accounting Adjustments		1,348
Measurement period adjustments (Note 2)			58,357
Balance	62,030	61,888	60,470
Direct
Goodwill [Roll Forward]
Balance	2,180	2,113	2,520
Currency exchange rate adjustment	155	67	(407)
Goodwill, Purchase Accounting Adjustments		0
Measurement period adjustments (Note 2)			0
Balance	2,335	2,180	2,113
Retail
Goodwill [Roll Forward]
Balance	59,708	58,357	0
Currency exchange rate adjustment	(13)	3	0
Goodwill, Purchase Accounting Adjustments		1,348
Measurement period adjustments (Note 2)			58,357
Balance	$ 59,695	$ 59,708	$ 58,357