Revenue and Segment Information - Revenue by Geographical Location (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Net Sales	$ 238,087	$ 215,389
United States
Disaggregation of Revenue [Line Items]
Net Sales	165,177	161,429
United Kingdom
Disaggregation of Revenue [Line Items]
Net Sales	13,443	10,267
France
Disaggregation of Revenue [Line Items]
Net Sales	24,927	19,149
Canada
Disaggregation of Revenue [Line Items]
Net Sales	14,234	11,114
Australia
Disaggregation of Revenue [Line Items]
Net Sales	2,382	3,198
Other
Disaggregation of Revenue [Line Items]
Net Sales	$ 17,924	$ 10,232