Revenue and Segment Information - Revenue by Geographical Location (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Net Sales	$ 257,572	$ 240,455	$ 752,784	$ 669,120
United States
Disaggregation of Revenue [Line Items]
Net Sales	188,037	174,807	536,505	486,513
United Kingdom
Disaggregation of Revenue [Line Items]
Net Sales	15,141	13,319	41,003	35,745
France
Disaggregation of Revenue [Line Items]
Net Sales	17,048	21,660	66,321	62,563
Canada
Disaggregation of Revenue [Line Items]
Net Sales	15,167	13,064	44,819	35,242
Australia
Disaggregation of Revenue [Line Items]
Net Sales	2,023	2,203	7,550	10,093
Brazil
Disaggregation of Revenue [Line Items]
Net Sales	3,050	4,058	13,368	6,579
Other
Disaggregation of Revenue [Line Items]
Net Sales	$ 17,106	$ 11,344	$ 43,218	$ 32,385