Goodwill and Other Intangible Assets Goodwill Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Document Period End Date	Mar. 31, 2019
Goodwill [Roll Forward]
Balance	$ 63,452	$ 62,030
Currency exchange rate adjustment	47	(180)
Business acquisition		1,602
Balance	63,499	63,452
Direct
Goodwill [Roll Forward]
Balance	3,752	2,335
Currency exchange rate adjustment	45	(185)
Business acquisition		1,602
Balance	3,797	3,752
Retail
Goodwill [Roll Forward]
Balance	59,700	59,695
Currency exchange rate adjustment	2	5
Business acquisition		0
Balance	$ 59,702	$ 59,700