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Derivatives And Risk Management (Derivative Instruments Summary) (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Gross Asset | $ 32,554,000 | $ 46,849,000
Gross Liability | (99,429,000) | (102,453,000)
Collateral Netted | 31,204,000 | 51,747,000
Net Asset (Liability) on Balance Sheet | (35,671,000) | (3,857,000)
Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Collateral Netted | 5,030,000 | 530,000
Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Collateral Netted | 26,174,000 | 51,217,000
Other Current Liabilities [Member] | Foreign Exchange Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset |  | 0
Gross Liability |  | (45,000)
Collateral Netted |  | 0
Net Asset (Liability) on Balance Sheet |  | (45,000)
Other Current Liabilities [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 0 |
Gross Liability | (4,771,000) |
Collateral Netted | 0 |
Net Asset (Liability) on Balance Sheet | (4,771,000) |
Other Current Liabilities [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 26,541,000 | 31,457,000
Gross Liability | (52,004,000) | (73,155,000)
Collateral Netted | 20,960,000 | 37,790,000
Net Asset (Liability) on Balance Sheet | (4,503,000) | (3,908,000)
Other Current Assets [Member] | Foreign Exchange Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 33,000 |
Gross Liability | 0 |
Collateral Netted | 0 |
Net Asset (Liability) on Balance Sheet | 33,000 |
Other Current Assets [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 771,000 | 5,283,000
Gross Liability | (338,000) | 0
Collateral Netted | 0 | 0
Net Asset (Liability) on Balance Sheet | 433,000 | 5,283,000
Other Current Assets [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 582,000 | 400,000
Gross Liability | (247,000) | (130,000)
Collateral Netted | 0 | 0
Net Asset (Liability) on Balance Sheet | 335,000 | 270,000
Other Property And Investments Net And Other Non-current Assets [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset |  | 5,283,000
Gross Liability |  | (440,000)
Collateral Netted |  | 0
Net Asset (Liability) on Balance Sheet |  | 4,843,000
Other Noncurrent Liabilities [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 631,000 | 0
Gross Liability | (27,309,000) | (7,391,000)
Collateral Netted | 5,030,000 | 530,000
Net Asset (Liability) on Balance Sheet | (21,648,000) | (6,861,000)
Other Noncurrent Liabilities [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 3,996,000 | 4,426,000
Gross Liability | (14,760,000) | (21,292,000)
Collateral Netted | 5,214,000 | 13,427,000
Net Asset (Liability) on Balance Sheet | $ (5,550,000) | $ (3,439,000)

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