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Significant Accounting Policies Significant Accounting Policies (Details) - Retained Earnings - USD ($) $ in Thousands | Jan. 01, 2017 | Jan. 01, 2016
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of new accounting principle in period of adoption | $ 2,213 | $ 0
Cumulative effect of adoption of ASU 2016-09 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of new accounting principle in period of adoption | $ 2,200 |

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