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Impact of Recently Issued Accounting Standards (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |
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Mar. 31, 2017 | Dec. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect adjustment of the adoption of ASU 2016-09 |  | $ (510)
Share-based compensation expense related to ASU 2016-09 adoption | $ 600 |
Retained Earnings [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect adjustment of the adoption of ASU 2016-09 |  | 302
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect adjustment of the adoption of ASU 2016-09 |  | $ 300

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