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Segment Reporting (Details) $ in Thousands	3 Months Ended									9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting [Abstract]
Number of operating segments										4		4
Number of reportable segments										1		1
Number of customers exceeding ten percent of net sales												0
Concentration Risk, Percentage												10.00%
Revenues from External Customers and Long-Lived Assets
Net Sales	$ 261,921	$ 211,746	$ 200,134	$ 216,828	$ 179,864	$ 205,853	$ 204,802	$ 215,404	$ 185,740	$ 723,771	$ 596,826	$ 808,572	$ 811,799	$ 821,983
Long-Lived Assets		158,677				126,600						158,677	126,600	131,678
Equipment
Revenues from External Customers and Long-Lived Assets
Net Sales												491,075	499,634	500,141
Parts and consumables
Revenues from External Customers and Long-Lived Assets
Net Sales												173,632	175,697	182,845
Service and other
Revenues from External Customers and Long-Lived Assets
Net Sales												114,719	112,622	114,027
Specialty surface coatings
Revenues from External Customers and Long-Lived Assets
Net Sales												29,146	23,846	24,970
Americas
Revenues from External Customers and Long-Lived Assets
Net Sales	161,037		152,294							472,953	449,704	607,026	591,405	569,004
Long-Lived Assets		134,737				110,842						134,737	110,842	103,958
Europe, Middle East, Africa
Revenues from External Customers and Long-Lived Assets
Net Sales	78,851		29,309							189,483	94,433	129,046	139,834	165,686
Long-Lived Assets		19,606				11,100						19,606	11,100	24,051
Asia Pacific
Revenues from External Customers and Long-Lived Assets
Net Sales	$ 22,033		$ 18,531							$ 61,335	$ 52,689	72,500	80,560	87,293
Long-Lived Assets		4,334				4,658						4,334	4,658	3,669
The Netherlands
Revenues from External Customers and Long-Lived Assets
Long-Lived Assets		$ 14,742				$ 9,724						$ 14,742	$ 9,724	$ 14,066

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- Definition

The number of customers exceeding ten percent of net sales.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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-Section 50
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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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