Summary of Significant Accounting Policies (Property and Equipment) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Unamortized amount of capitalized software	4.1
Buildings and leasehold improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Buildings and leasehold improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	30 years
Machinery, equipment and rental tools [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years
Machinery, equipment and rental tools [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	10 years
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Transportation equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Transportation equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Computer equipment and software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Computer equipment and software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years
Computer software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Computer software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years