Risk Management (Tables)

12 Months Ended

Dec. 31, 2017

Risk Management - Notional Amounts and Terms of Companys Derivative Financial Instruments [Abstract]

Notional Amounts And Terms Of Company's Derivative Financial Instruments

The notional amounts and terms of our derivative financial instruments include the following:

	December 31, 2017		December 31, 2016
	Fixed Price Payor	Fixed Price Receiver	Fixed Price Payor	Fixed Price Receiver
Propane, crude and heating oil (MMBbls)	15.3	17.5	13.1	15.1
Natural gas (MMcf)	780	660	—	—