Summary of Significant Accounting Policies (Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Schedule of Investments [Line Items]
Cash and cash equivalents	$ 36,312	$ 28,548	$ 34,144	$ 65,030
Short-term investments	2,252	4,252
Long-term investments	10,033	8,067
Certificates of deposit
Schedule of Investments [Line Items]
Cash and cash equivalents		0
Short-term investments		252
Long-term investments		0
Debt securities
Schedule of Investments [Line Items]
Cash and cash equivalents	0	0
Short-term investments	2,252	4,000
Long-term investments	10,033	8,067
Cash and money market accounts
Schedule of Investments [Line Items]
Cash and cash equivalents	36,312	28,548
Short-term investments	0	0
Long-term investments	$ 0	$ 0