Summary of Significant Accounting Policies (Property and Equipment) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items]
Unamortized amount of capitalized software	$ 5.7
Buildings and leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Buildings and leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	30 years
Machinery, equipment, and rental tools | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years
Machinery, equipment, and rental tools | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	10 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Transportation equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Transportation equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Computer equipment and software | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Computer equipment and software | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years
Computer software | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Computer software | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years