Business Acquisitions - Narrative (Details)	3 Months Ended			3 Months Ended
	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2014 Australia [Member] USD ($)	Jun. 30, 2014 Australia [Member] AUD	Sep. 30, 2014 ECLI [Member] USD ($)	Sep. 30, 2014 ECLI [Member] Customer Relationships [Member]	Sep. 30, 2014 ECLI [Member] Noncompete Agreements [Member]	Sep. 30, 2014 ECLI [Member] Other Intangible Assets [Member]	Dec. 31, 2014 Mining [Member] USD ($)	Dec. 31, 2014 Mining [Member] AUD	Dec. 31, 2014 Mining [Member] Customer Lists [Member]	Dec. 31, 2014 Mining [Member] Noncompete Agreements [Member]	Dec. 31, 2014 Mining [Member] Other Intangible Assets [Member]	Mar. 31, 2015 Binol [Member] USD ($)	Mar. 31, 2015 Binol [Member] SEK	Dec. 31, 2014 Binol [Member] USD ($)	Dec. 31, 2014 Binol [Member] SEK	Dec. 31, 2014 Binol [Member] Customer Lists [Member]	Dec. 31, 2014 Binol [Member] Noncompete Agreements [Member]	Dec. 31, 2014 Binol [Member] Other Intangible Assets [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions	$ (528,000)	$ 0		$ 7,577,000	8,000,000	$ 53,145,000				$ 2,355,000	2,850,000						$ 18,536,000	136,500,000
Goodwill	75,169,000		77,933,000			14,612,000				1,075,000							5,602,000
Intangibles						31,050,000				1,802,000							11,805,000
Intangible Assets, Amortizable Life							15 years	5 years	10 years			15 years	5 years	15 years					14 years	5 years	15 years
Percentage of Voting Interests Acquired				49.00%	49.00%
Post Closing Adjustment															528,000	4,400,000
Adjustments To Additional Paid In Capital Other				6,450,000
Present Value of Hold-back										$ 248,000	300,000