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Reconciliation of Statutory Canadian Tax rate to Effective Tax Rate (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Oct. 02, 2015 | Jul. 03, 2015 | Apr. 03, 2015 | Dec. 31, 2014 | Sep. 26, 2014 | Jun. 27, 2014 | Mar. 28, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule Of Effective Tax Rate Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income Tax Provision (benefit) | $ (168) | $ 2,452 | $ 6,310 | $ 1,800 | $ (6,013) | $ 2,013 | $ 2,057 | $ 937 | $ 10,394 | $ (1,006) | $ 6,200
Canada Revenue Agency |  |  |  |  |  |  |  |  |  |  |
Schedule Of Effective Tax Rate Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Statutory Canadian tax rate |  |  |  |  |  |  |  |  | 27.00% | 27.00% | 26.00%
Expected income tax provision at Canadian statutory tax rate |  |  |  |  |  |  |  |  | $ 12,426 | $ (4,837) | $ 4,206
International tax rate differences |  |  |  |  |  |  |  |  | 304 | (1,132) | 156
State income taxes, net |  |  |  |  |  |  |  |  | 453 | (271) | 148
Withholding and other taxes |  |  |  |  |  |  |  |  | 680 | 421 | 321
Permanent differences |  |  |  |  |  |  |  |  | 1,130 | 486 | 106
Section 199 deduction |  |  |  |  |  |  |  |  | (1,188) | (574) |
Change in valuation allowance |  |  |  |  |  |  |  |  | (612) | 4,809 | (3,076)
Provision to return differences |  |  |  |  |  |  |  |  | (617) | 962 | (312)
Tax credits |  |  |  |  |  |  |  |  | (990) | (1,678) | (938)
Net operating loss expirations |  |  |  |  |  |  |  |  |  |  | 4,538
Statutory tax rate change |  |  |  |  |  |  |  |  | 95 | (13) | 354
Uncertain tax positions |  |  |  |  |  |  |  |  | 121 | 134 | 259
IRS audit |  |  |  |  |  |  |  |  | (748) | 241 | 680
JK Lasers divestiture |  |  |  |  |  |  |  |  | (1,432) |  |
Goodwill impairment |  |  |  |  |  |  |  |  |  | 330 |
Other |  |  |  |  |  |  |  |  | 772 | 116 | (242)
Income Tax Provision (benefit) |  |  |  |  |  |  |  |  | $ 10,394 | $ (1,006) | $ 6,200
Effective tax rate |  |  |  |  |  |  |  |  | 22.60% | 5.60% | 38.30%

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