Derivative Instruments and Hedging Activities Notional Contracts by Derivative Type (Details) - 12 months ended Dec. 31, 2018	USD ($) MMBTU bbl	XPT ( )
Foreign currency forward contracts
economic hedges by derivative type [Line Items]
Derivative, Notional Amount | $	$ 440,460,402
Commodity forward contracts
economic hedges by derivative type [Line Items]
Derivative, Nonmonetary Notional Amount, Volume	325,000
Natural Gas Liquids
economic hedges by derivative type [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	5,400,000
Crude Oil
economic hedges by derivative type [Line Items]
Derivative, Nonmonetary Notional Amount, Volume	9,503,000
NYMEX WTI Short
economic hedges by derivative type [Line Items]
Derivative, Nonmonetary Notional Amount, Volume	650,000
Commodity price swaps
economic hedges by derivative type [Line Items]
Derivative, Notional Amount |		41,147
Designated as Hedging Instrument [Member] | Maturing in Next Twelve Months [Member] | Natural Gas Liquids
economic hedges by derivative type [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	1,800,000
Designated as Hedging Instrument [Member] | Maturing in Next Twelve Months [Member] | Crude Oil
economic hedges by derivative type [Line Items]
Derivative, Nonmonetary Notional Amount, Volume	4,745,000
Designated as Hedging Instrument [Member] | Maturing in Year Two [Member] | Natural Gas Liquids
economic hedges by derivative type [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	1,800,000
Designated as Hedging Instrument [Member] | Maturing in Year Two [Member] | Crude Oil
economic hedges by derivative type [Line Items]
Derivative, Nonmonetary Notional Amount, Volume	4,758,000
Designated as Hedging Instrument [Member] | Maturing in Year Three [Member] | Natural Gas Liquids
economic hedges by derivative type [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	1,800,000
Not Designated as Hedging Instrument [Member] | Maturing in Next Twelve Months [Member] | Foreign currency forward contracts
economic hedges by derivative type [Line Items]
Derivative, Notional Amount | $	$ 440,460,402
Not Designated as Hedging Instrument [Member] | Maturing in Next Twelve Months [Member] | Commodity forward contracts
economic hedges by derivative type [Line Items]
Derivative, Nonmonetary Notional Amount, Volume	325,000
Not Designated as Hedging Instrument [Member] | Maturing in Next Twelve Months [Member] | NYMEX WTI Short
economic hedges by derivative type [Line Items]
Derivative, Nonmonetary Notional Amount, Volume	650,000
Not Designated as Hedging Instrument [Member] | Maturing in Next Twelve Months [Member] | Commodity price swaps
economic hedges by derivative type [Line Items]
Derivative, Notional Amount |		41,147