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Accounting Standards Updates Accounting Standards Updates - Additional Information (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of new accounting principle in period of adoption | $ (12,611) | $ (2,285)
Retained Earnings [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of new accounting principle in period of adoption | $ (12,611) | $ (2,285)

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