Impact of Recently Issued Accounting Standards (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	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