Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue [Table Text Block]

The following tables illustrate the disaggregation of revenue by geographic area, groups of similar products and services and sales channels for the twelve months ended December 31, 2018, 2017 and 2016 (in thousands):

Net Sales by geographic area

	Twelve Months Ended
	December 31
	2018		2017		2016
Americas	$	690,996	$	640,274	$	607,026
Europe, Middle East and Africa	335,603		273,738		129,046
Asia Pacific	96,912		89,054		72,500
Total	$	1,123,511	$	1,003,066	$	808,572

Net Sales are attributed to each geographic area based on the end user country and are net of intercompany sales.

Net Sales by groups of similar products and services

	Twelve Months Ended
	December 31
	2018		2017		2016
Equipment	$	729,993	$	636,875	$	491,075
Parts and Consumables	222,345		202,452		173,632
Specialty Surface Coatings	29,827		31,407		29,146
Service and Other	141,346		132,332		114,719
Total	$	1,123,511	$	1,003,066	$	808,572

Net Sales by sales channel

	Twelve Months Ended
	December 31
	2018		2017		2016
Sales Direct to Consumer	$	735,244	$	674,495	$	609,538
Sales to Distributors	388,267		328,571		199,034
Total	$	1,123,511	$	1,003,066	$	808,572

Contract with Customer, Asset and Liability [Table Text Block]

The change in our sales incentive accrual balance for the twelve months ended December 31, 2018 was as follows:

	Twelve Months Ended
	December 31
	2018
Beginning balance	$	13,466
Additions to sales incentive accrual	30,458
Contract payments	(26,992		)
Foreign currency fluctuations	(280		)
Ending balance	$	16,652

Deferred Revenue, by Arrangement, Disclosure [Table Text Block]

The change in the deferred revenue balance for the twelve months ended December 31, 2018 was as follows:

	Twelve Months Ended
	December 31
	2018
Beginning balance	$	7,787
Increase in deferred revenue representing our obligation to satisfy future performance obligations	14,650
Decrease in deferred revenue for amounts recognized in Net Sales for satisfied performance obligations	(13,755		)
Foreign currency fluctuations	(157		)
Ending balance	$	8,525

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]

At December 31, 2018, $5,021 and $3,504 of deferred revenue was reported in Other Current Liabilities and Other Liabilities, respectively, on our Condensed Consolidated Balance Sheets. Of this, we expect to recognize the following approximate amounts in Net Sales in the following periods:

2019	$	5,021
2020	1,865
2021	1,044
2022	442
2023	153
Thereafter	—
Total	$	8,525