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Summary of Significant Accounting Policies - Property and Equipment Included in Other Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Property and Equipment |  |
Property and equipment | $ 142,243 | $ 133,803
Less: accumulated depreciation | 101,267 | 94,862
Total | $ 40,976 | $ 38,941

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