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Summary of Significant Accounting Policies (Recently Adopted Accounting Standards) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of a accounting change | $ 296,634 | $ 289,904 | $ 283,266 | $ 244,072
Right of use assets | 18,944 | 22,027 |  |
Lease liabilities | $ 19,705 | 22,527 |  |
ASU 2019-12 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of a accounting change |  | $ 13,750 |  |

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