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Accumulated Other Comprehensive Income (Reclassifications out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 26, 2015 | Sep. 26, 2015 | Jun. 27, 2015 | Mar. 28, 2015 | Dec. 27, 2014 | Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Dec. 26, 2015 | Dec. 27, 2014 | Dec. 28, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income |  |  |  |  |  |  |  |  | $ 1,552 | $ 2,287 | $ 4,684
Provision for income taxes |  |  |  |  |  |  |  |  | (33,001) | (29,281) | (45,170)
Net income | $ 16,575 | $ 12,788 | $ 16,644 | $ 13,323 | $ 13,698 | $ 13,511 | $ 12,602 | $ 14,570 | 59,330 | 54,381 | 73,186
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income |  |  |  |  |  |  |  |  | 27 | 63 | 1,774
Provision for income taxes |  |  |  |  |  |  |  |  | (11) | (26) | (730)
Net income |  |  |  |  |  |  |  |  | $ 16 | $ 37 | $ 1,044

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