Acquisitions and Dispositions (Details 1) (USD $)	3 Months Ended		3 Months Ended
	Mar. 31, 2014 Joint Venture [Member]	Jan. 16, 2014 Joint Venture [Member]	Mar. 31, 2014 TD EnerServ [Member]	Jan. 29, 2014 TD EnerServ [Member]	Jan. 29, 2014 TD EnerServ [Member] Minimum [Member]
Business Acquisitions [Line Items]
Date of acquisition	Jan. 16, 2014		Jan. 29, 2014
Percentage of ownership interest acquired		50.00%
Total ownership interest resulting from acquisition		100.00%
Ownership interest immediately prior to acquisition		50.00%
Purchase price	$ 25,200,000		$ 15,000,000
Amount paid at closing		15,000,000
Additional consideration payable at a later date		10,200,000
Due date of second payment	Jul. 16, 2014
Fair value of existing investment in acquiree	22,000,000
Remeasurement gain	5,700,000
Charge to earnings associated with termination of prior relationship	2,900,000
Contingent consideration, minimum possible payment					0
Contingent consideration, maximum possible payment				8,000,000
Purchase price allocation, net working capital		18,500,000
Purchase price allocation, property, plant, and equipment		1,300,000		6,700,000
Purchase price allocation, intangible assets		22,500,000		1,800,000
Purchase price allocation, deferred tax liabilities		4,500,000
Purchase price allocation, liabilities associated with contingent purchase price consideration				2,400,000
Purchase price allocation, nondeductible goodwill	6,300,000		8,900,000
Revenues from acquired entitiy	6,800,000
Depreciation and amortization from acquired entity	300,000
Pretax earnings from acquired entity	$ 200,000