Acquisition Acquisition (Details 2) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Property, plant and equipment [Line Items]
Intangible assets, accumulated amortization		$ 7,425,000	$ 3,826,000
Compressor Systems, Inc. [Member]
Property, plant and equipment [Line Items]
Value of trademarks/tradenames		33,700,000
Value of customer relationships		21,400,000
Value of other intangible assets		12,900,000
Intangible assets, accumulated amortization		$ 6,800,000	$ 4,100,000
Minimum [Member]
Property, plant and equipment [Line Items]
Intangible assets other than goodwill, useful lives			2 years
Minimum [Member] | Finite-Lived Intangible Assets [Member] | Compressor Systems, Inc. [Member]
Property, plant and equipment [Line Items]
Intangible assets other than goodwill, useful lives		2 years
Maximum [Member]
Property, plant and equipment [Line Items]
Intangible assets other than goodwill, useful lives		15 years
Maximum [Member] | Finite-Lived Intangible Assets [Member] | Compressor Systems, Inc. [Member]
Property, plant and equipment [Line Items]
Intangible assets other than goodwill, useful lives	15 years
Building [Member] | Minimum [Member]
Property, plant and equipment [Line Items]
Property, plant and equipment, useful life		15 years
Building [Member] | Minimum [Member] | Compressor Systems, Inc. [Member]
Property, plant and equipment [Line Items]
Property, plant and equipment, useful life		15 years
Building [Member] | Maximum [Member]
Property, plant and equipment [Line Items]
Property, plant and equipment, useful life		30 years
Building [Member] | Maximum [Member] | Compressor Systems, Inc. [Member]
Property, plant and equipment [Line Items]
Property, plant and equipment, useful life		30 years
Machinery and Equipment [Member] | Minimum [Member] | Compressor Systems, Inc. [Member]
Property, plant and equipment [Line Items]
Property, plant and equipment, useful life		2 years
Machinery and Equipment [Member] | Maximum [Member] | Compressor Systems, Inc. [Member]
Property, plant and equipment [Line Items]
Property, plant and equipment, useful life		20 years
Automobiles and Trucks [Member] | Minimum [Member]
Property, plant and equipment [Line Items]
Property, plant and equipment, useful life		3 years
Automobiles and Trucks [Member] | Minimum [Member] | Compressor Systems, Inc. [Member]
Property, plant and equipment [Line Items]
Property, plant and equipment, useful life		3 years
Automobiles and Trucks [Member] | Maximum [Member]
Property, plant and equipment [Line Items]
Property, plant and equipment, useful life		5 years
Automobiles and Trucks [Member] | Maximum [Member] | Compressor Systems, Inc. [Member]
Property, plant and equipment [Line Items]
Property, plant and equipment, useful life		4 years