Derivative Instruments And Hedging Activities Notional Contracts by Derivative Type (Details) - 6 months ended Jun. 30, 2019	USD ($) MMBTU bbl	XPT ( )
Commodity Contract [Member]
Economic hedges by derivative type [Line Items]
Derivative, Notional Amount |		41,147
Designated as Hedging Instrument [Member] | Natural Gas [Member]
Economic hedges by derivative type [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	4,500,000
Designated as Hedging Instrument [Member] | Price Risk Derivative [Member]
Economic hedges by derivative type [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net	7,150,000
Designated as Hedging Instrument [Member] | Maturing in Next Twelve Months [Member] | Natural Gas [Member]
Economic hedges by derivative type [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	900,000
Designated as Hedging Instrument [Member] | Maturing in Next Twelve Months [Member] | Price Risk Derivative [Member]
Economic hedges by derivative type [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net	2,392,000
Designated as Hedging Instrument [Member] | Maturing in Year Two [Member] | Natural Gas [Member]
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] | Price Risk Derivative [Member]
Economic hedges by derivative type [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net	4,758,000
Designated as Hedging Instrument [Member] | Maturing in Year Three [Member] | Natural Gas [Member]
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 Three [Member] | Price Risk Derivative [Member]
Economic hedges by derivative type [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net	0
Not Designated as Hedging Instrument [Member]
Economic hedges by derivative type [Line Items]
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | $	$ 435,734,135
Not Designated as Hedging Instrument [Member] | WTI Crude Oil [Member]
Economic hedges by derivative type [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net	1,464,000
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Economic hedges by derivative type [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net	400,000
Not Designated as Hedging Instrument [Member] | Maturing in Next Twelve Months [Member]
Economic hedges by derivative type [Line Items]
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | $	$ 223,084,671
Not Designated as Hedging Instrument [Member] | Maturing in Next Twelve Months [Member] | WTI Crude Oil [Member]
Economic hedges by derivative type [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net	0
Not Designated as Hedging Instrument [Member] | Maturing in Next Twelve Months [Member] | Commodity Contract [Member]
Economic hedges by derivative type [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net	400,000
Derivative, Notional Amount |		41,147
Not Designated as Hedging Instrument [Member] | Maturing in Year Two [Member]
Economic hedges by derivative type [Line Items]
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | $	$ 212,649,464
Not Designated as Hedging Instrument [Member] | Maturing in Year Two [Member] | WTI Crude Oil [Member]
Economic hedges by derivative type [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net	1,464,000