Summary of Significant Accounting Policies Property, plant and equipment (Details)	12 Months Ended
	Dec. 31, 2020
Buildings | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	10 years
Buildings | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	30 years
Leasehold improvements | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Leasehold improvements | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	10 years
Service, transportation and field service equipment | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Service, transportation and field service equipment | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	7 years
Furniture and office equipment | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Furniture and office equipment | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	7 years