| **Derivative Financial Instruments Effect of Master Netting Agreements (Details) - USD ($) $ in Thousands** | 12 Months Ended |           |
|-------------------------------------------------------------------------------------------------------------|-----------------|-----------|
||
| **Derivative [Line Items]**                                                                                 |            |      |
| Document Period End Date                                                                                    | Dec. 31,  2019  |      |
| Derivative Liability                                                                                        | $ 994           | $ 743     |
| **Derivative Asset [Abstract]**                                                                             |            |      |
| Derivative Asset, Fair Value, Gross Asset                                                                   | 31,824          | 178,214   |
| Derivative Asset, Fair Value, Amount Not Offset Against Collateral                                          | (2,619)         | (3,985)   |
| Derivative Asset                                                                                            | 29,205          | 174,229   |
| **Derivative Liability [Abstract]**                                                                         |            |      |
| Derivative Liability, Fair Value, Gross Liability                                                           | 3,613           | 4,728     |
| Derivative Liability, Fair Value, Amount Not Offset Against Collateral                                      | $ (2,619)       | $ (3,985) |

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The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented.  If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.
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| - Definition
Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.
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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.
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| - Definition
Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.
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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.
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| - Definition
Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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