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Derivatives And Risk Management (Derivative Instruments Summary) (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Asset | $ 43,222,000 | $ 46,849,000
Liability | (82,203,000) | (102,453,000)
Collateral Netting | 10,148,000 | 51,747,000
Net Asset (Liability) | (28,833,000) | (3,857,000)
Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Collateral Netting | 6,770,000 | 530,000
Collateral Already Posted, Aggregate Fair Value | 6,770,000 | 530,000
Commodity Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Collateral Netting | 3,378,000 | 51,217,000
Collateral Already Posted, Aggregate Fair Value | 7,812,000 | 78,025,000
Other Current Assets [Member] | Foreign Currency Exchange Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset | 97,000 |
Liability | 0 |
Collateral Netting | 0 |
Net Asset (Liability) | 97,000 |
Other Current Assets [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset | 589,000 | 5,283,000
Liability | 0 | 0
Collateral Netting | 0 | 0
Net Asset (Liability) | 589,000 | 5,283,000
Other Current Assets [Member] | Commodity Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset | 416,000 | 400,000
Liability | (245,000) | (130,000)
Collateral Netting | 0 | 0
Net Asset (Liability) | 171,000 | 270,000
Other Noncurrent Assets [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset |  | 5,283,000
Liability |  | (440,000)
Collateral Netting |  | 0
Net Asset (Liability) |  | 4,843,000
Other Noncurrent Assets [Member] | Commodity Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset | 6,369,000 |
Liability | (5,446,000) |
Collateral Netting | 0 |
Net Asset (Liability) | 923,000 |
Other Noncurrent Liabilities [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset | 725,000 | 0
Liability | (24,677,000) | (7,391,000)
Collateral Netting | 5,454,000 | 530,000
Net Asset (Liability) | (18,498,000) | (6,861,000)
Other Noncurrent Liabilities [Member] | Commodity Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset | 28,000 | 4,426,000
Liability | (1,215,000) | (21,292,000)
Collateral Netting | 0 | 13,427,000
Net Asset (Liability) | (1,187,000) | (3,439,000)
Other Current Liabilities [Member] | Foreign Currency Exchange Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset |  | 0
Liability |  | (45,000)
Collateral Netting |  | 0
Net Asset (Liability) |  | (45,000)
Other Current Liabilities [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset | 238,000 |
Liability | (9,379,000) |
Collateral Netting | 1,316,000 |
Net Asset (Liability) | (7,825,000) |
Other Current Liabilities [Member] | Commodity Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset | 34,760,000 | 31,457,000
Liability | (41,241,000) | (73,155,000)
Collateral Netting | 3,378,000 | 37,790,000
Net Asset (Liability) | $ (3,103,000) | $ (3,908,000)

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