Business Acquisitions - Narrative (Details) $ in Thousands, € in Millions, SEK in Millions, CAD in Millions, AUD in Millions	3 Months Ended							12 Months Ended
	Dec. 31, 2016 CAD	Jun. 30, 2016 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 USD ($)	Mar. 31, 2015 SEK	Mar. 31, 2015 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2015 EUR (€)	Sep. 30, 2015 USD ($)	Dec. 31, 2014 AUD	Dec. 31, 2014 SEK	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 AUD	Jun. 30, 2014 USD ($)	Dec. 31, 2010 USD ($)
Business Acquisition [Line Items]
Goodwill				$ 79,111					$ 79,111		$ 80,804					$ 77,933
Contingent Consideration Paid								$ 0	$ 226	$ 4,709
Summit [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions																				$ 29,800
Contingent Consideration Paid							$ 4,700
Australia [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions																		AUD 8.0	$ 7,600
Percentage of Voting Interests Acquired																		49.00%	49.00%
Adjustments To Additional Paid In Capital Other							$ 6,500
Mining [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions		$ 1,900												AUD 2.9		2,400
Goodwill		100
Intangibles		$ 1,700
Present Value of Holdback														AUD 0.3		200
Mining [Member] | Customer Lists [Member]
Business Acquisition [Line Items]
Intangible Assets, Amortizable Life		15 years
Mining [Member] | Noncompete Agreements [Member]
Business Acquisition [Line Items]
Intangible Assets, Amortizable Life		5 years
Mining [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Intangible Assets, Amortizable Life		15 years
Binol [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions															SEK 136.5	18,500
Post Closing Adjustment					SEK 4.4	$ 500
ECLI [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions																	$ 53,100
2014 Acquisitions [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions																72,999
Goodwill																21,546
Cash Acquired																$ 1,037
Verkol [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions											25,970	€ 37.7	$ 41,400
Long-term Debt											(2,400)	(2.2)	(2,400)
Goodwill											5,051
Post Closing Adjustment			€ 1.3	$ 1,400
Cash Acquired											15,423	€ 14.1	$ 15,400
Lubricor [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions	CAD 15.9										11,900
Goodwill											3,200
Intangibles											$ 6,100
Lubricor [Member] | Customer Lists [Member]
Business Acquisition [Line Items]
Intangible Assets, Amortizable Life	15 years
Lubricor [Member] | Noncompete Agreements [Member]
Business Acquisition [Line Items]
Intangible Assets, Amortizable Life	5 years
Lubricor [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Intangible Assets, Amortizable Life	15 years