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Recent Accounting Developments (Narratives) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle\ |  |  |
ROU assets | $ 18,490 |  |
Lease liability | $ 19,901 |  |
Prepaid rent |  |  | $ 1,400
ASU 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle\ |  |  |
ROU assets |  | $ 18,600 |
Lease liability |  | $ 20,000 |

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