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Derivatives And Risk Management (Derivative Instruments Summary) (Details) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Gross Asset | $ 35,595,000 | $ 46,849,000
Gross Liability | (96,278,000) | (102,453,000)
Collateral Netted | 12,385,000 | 51,747,000
Net Asset (Liability) on Balance Sheet | (48,298,000) | (3,857,000)
Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Collateral Netted | 8,880,000 | 530,000
Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Collateral Netted | 3,505,000 | 51,217,000
Other Current Liabilities [Member] | Foreign Exchange Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 0 | 0
Gross Liability | (21,000) | (45,000)
Collateral Netted | 0 | 0
Net Asset (Liability) on Balance Sheet | (21,000) | (45,000)
Other Current Liabilities [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 27,506,000 | 31,457,000
Gross Liability | (34,120,000) | (73,155,000)
Collateral Netted | 3,505,000 | 37,790,000
Net Asset (Liability) on Balance Sheet | (3,109,000) | (3,908,000)
Other Current Assets [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset |  | 5,283,000
Gross Liability |  | 0
Collateral Netted |  | 0
Net Asset (Liability) on Balance Sheet |  | 5,283,000
Other Current Assets [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 677,000 | 400,000
Gross Liability | (437,000) | (130,000)
Collateral Netted | 0 | 0
Net Asset (Liability) on Balance Sheet | 240,000 | 270,000
Other Property And Investments Net And Other Non-current Assets [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 4,127,000 | 5,283,000
Gross Liability | (3,486,000) | (440,000)
Collateral Netted | 0 | 0
Net Asset (Liability) on Balance Sheet | 641,000 | 4,843,000
Other Noncurrent Liabilities [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 0 | 0
Gross Liability | (53,271,000) | (7,391,000)
Collateral Netted | 8,880,000 | 530,000
Net Asset (Liability) on Balance Sheet | (44,391,000) | (6,861,000)
Other Noncurrent Liabilities [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 3,285,000 | 4,426,000
Gross Liability | (4,943,000) | (21,292,000)
Collateral Netted | 0 | 13,427,000
Net Asset (Liability) on Balance Sheet | $ (1,658,000) | $ (3,439,000)

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