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Basis Of Presentation (Details) - USD ($) | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Jan. 01, 2019
Basis Of Presentation [Abstract] |  |  |  |  |
U.S. tax rate | 35.00% | 21.00% |  |  |
Reclass due to early adoption of Accounting Standards Update 2018-02 |  |  | $ 1,250,000 |  |
Cumulative change due to ASU |  |  | $ (1,201,000) |  | $ 0
Operating lease right of use assets |  |  |  | $ 58,754,000 | 69,869,000
Operating lease liabilities |  |  |  | $ 65,138,000 | $ 77,270,000

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