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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Derivative [Line Items] |  |  |  |  |  |
Unrealized gains, before tax | $ (8,954,000) |  | $ (1,182,000) | $ 108,508,000 | $ (1,182,000) |
Unrealized gain, after tax | (6,635,000) |  | $ (876,000) | 80,404,000 | $ (876,000) |
Income recognized | 1,000,000.0 |  |  | 1,400,000 |  |
Cash flow hedge gain (loss) to be reclassified |  |  |  | 40,000,000 |  |
Cash flow hedge termination gain |  |  |  | 5,000,000 |  |
Collateral requirements | 159,800,000 |  |  | 159,800,000 |  | $ 84,600,000
Variation margin, amount reducing derivative asset | 187,000,000.0 |  |  | 187,000,000.0 |  | 113,700,000
Foreign Currency Exchange Forwards |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 25,100,000 |  |  | $ 25,100,000 |  | $ 32,900,000
Cash Flow Hedges |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Unrealized gains, before tax |  | $ 9,800,000 |  |  |  |
Unrealized gain, after tax |  | $ 7,300,000 |  |  |  |

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
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