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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Accounting Standards Update, 2018-02 |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Reclassification from AOCI to retained earnings, tax effect | $ (2,046)

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- Details
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