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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jan. 01, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |  |  |  |
Impact to Retained Earnings |  | $ 668,126 | $ 628,433 | $ 593,043 | $ 585,304 | $ 557,630 | $ 532,088 | $ 515,195 | $ 498,047
Lease right-of-use assets |  | 95,815 |  |  | 84,073 |  |  |  |
Operating lease liability |  | $ 98,006 |  |  | 86,713 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |  |  |  |
Impact to Retained Earnings |  |  |  |  | $ (515) |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |  |  |  |
Impact to Retained Earnings | $ 500 |  |  |  |  |  |  |  |
Adjustments | ASU 2016-13 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |  |  |  |
Increase in allowance for doubtful accounts | 700 |  |  |  |  |  |  |  |
Increase to Deferred Tax Assets | $ 200 |  |  |  |  |  |  |  |

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