Business Acquisitions - Narrative (Details) $ in Thousands, € in Millions, SEK in Millions	3 Months Ended									6 Months Ended
	Jun. 30, 2016 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 EUR (€)	Sep. 30, 2015 USD ($)	Mar. 31, 2015 SEK	Mar. 31, 2015 USD ($)	Dec. 31, 2014 SEK	Dec. 31, 2014 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)
Business Acquisition [Line Items]
Cash Paid for Acquisitions										$ 3,284	$ (528)
Goodwill	$ 79,324		$ 79,111							79,324
Binol [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions								SEK 136.5	$ 18,500
Post Closing Adjustment						SEK 4.4	$ 500
Verkol [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions				€ 37.7	$ 41,400
Long-Term Debt				2.2								$ 2,400
Post Closing Adjustment		€ 1.3	$ 1,400
Cash Acquired				€ 14.1								$ 15,400
Mining North America [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions	1,900
Inventory	100									100
Goodwill	100									100
Intangibles	$ 1,700									$ 1,700
Mining North America [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible Assets, Amortizable Life	15 years
Mining North America [Member] | Noncompete Agreements [Member]
Business Acquisition [Line Items]
Intangible Assets, Amortizable Life	5 years
Mining North America [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Intangible Assets, Amortizable Life	15 years