Summary of Significant Accounting Policies (PP&E) (Details)	12 Months Ended
	Dec. 31, 2016
Buildings | Minimum
Property, Plant and Equipment, net
Estimated useful lives	20 years
Buildings | Maximum
Property, Plant and Equipment, net
Estimated useful lives	30 years
Transportation equipment | Minimum
Property, Plant and Equipment, net
Estimated useful lives	5 years
Transportation equipment | Maximum
Property, Plant and Equipment, net
Estimated useful lives	15 years
Propane tanks and cylinders | Minimum
Property, Plant and Equipment, net
Estimated useful lives	3 years
Propane tanks and cylinders | Maximum
Property, Plant and Equipment, net
Estimated useful lives	25 years
Bulk storage tanks | Maximum
Property, Plant and Equipment, net
Estimated useful lives	20 years
Pipelines and linefill | Maximum
Property, Plant and Equipment, net
Estimated useful lives	20 years
Office furniture and fixtures | Minimum
Property, Plant and Equipment, net
Estimated useful lives	5 years
Office furniture and fixtures | Maximum
Property, Plant and Equipment, net
Estimated useful lives	10 years
Other equipment | Minimum
Property, Plant and Equipment, net
Estimated useful lives	3 years
Other equipment | Maximum
Property, Plant and Equipment, net
Estimated useful lives	31 years