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Description of Business and Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings | $ 8,608,284 |  | $ 8,211,257 |
Assets | 9,152,074 |  | $ 8,669,477 |
Accounting Standards Update 2016-02 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Assets |  |  |  | $ 163,000
Accounting Standards Update 2016-13 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings | (2,112) | $ (2,100) |  |
Retained Earnings Effect, Tax | $ 600 |  |  |

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