Stockholders' Equity (Narrative) (Details) $ / shares in Units, $ in Thousands		9 Months Ended	12 Months Ended
	Mar. 10, 2015 $ / shares shares	Oct. 03, 2015	Dec. 31, 2016 USD ($) plan $ / shares shares	Jan. 02, 2016 USD ($) $ / shares shares	Jan. 03, 2015 USD ($) tranch $ / shares shares	May 31, 2012 shares
Class of Stock [Line Items]
Number of equity incentive plans | plan			4
Contractual terms of options granted			2 years
Compensation expense | $			$ 16,213	$ 21,643	$ 12,802
Conversion ratio	1.09816
Number of outstanding option			12,566,000	11,444,000
Cash used to settle awards | $				$ 3,900
Total unrecognized compensation cost related to unvested employee and director stock options | $			$ 11,000
Total intrinsic value of options exercised | $			3,300	2,500	7,800
Total fair value of options and RSU's vested and expensed | $			$ 15,600	$ 18,000	$ 12,800
Grant date weighted average fair values based on fair value assumptions, options | $ / shares			$ 2.14	$ 2.35	$ 2.93
Grant date weighted average fair values based on fair assumptions, non-options | $ / shares			$ 1.82	$ 1.51	$ 1.73
Granted, Shares			3,907,000
Award vesting comparison period			2 years
1996 Stock Incentive Plan and the 2001 Stock Plan
Class of Stock [Line Items]
Number of shares available for future awards			0
2012 ESPP
Class of Stock [Line Items]
Number of shares available for future awards			1,900,000
Number of shares authorized						3,000,000
Percentage of employee's compensation maximum for employee share purchases			10.00%
Purchase price of shares as percentage of fair market value			85.00%
2013 Incentive Plan and the 2011 Non-Employee Director Equity Incentive Plan
Class of Stock [Line Items]
Number of shares available for future awards			1,300,000
Stock options
Class of Stock [Line Items]
Award vesting period			4 years
Number of outstanding option	2,087,605		787,130
Weighted average period for recognition			2 years 7 months 17 days
Performance Shares
Class of Stock [Line Items]
Award vesting period			2 years
Compensation expense | $			$ 800	$ 600
Granted, Shares			321,900	327,200
Awards canceled, Shares			21,540
Number of options outstanding			596,600
Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Award vesting period			4 years
Compensation expense | $					$ 700
Stock conversion offer price | $ / shares	$ 7.30
Number of outstanding option	2,025,255		228,659
Grant date weighted average fair values based on fair assumptions, non-options | $ / shares			$ 5.64
Unrecognized compensation expense related to unvested RSU's | $			$ 16,200
Granted, Shares				70,000	98,600
Awards canceled, Shares			70,000
Number of tranches in award grants | tranch					2
Maximum
Class of Stock [Line Items]
Contractual terms of options granted		10 years
Maximum | 2012 ESPP
Class of Stock [Line Items]
Compensation expense | $			$ 600	$ 400	$ 300
Maximum | Performance Shares
Class of Stock [Line Items]
Award vesting percentage			200.00%
Minimum | Performance Shares
Class of Stock [Line Items]
Award vesting percentage			0.00%