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Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 03, 2017	Sep. 27, 2016	Jun. 28, 2016	Mar. 29, 2016	Dec. 29, 2015	Sep. 29, 2015	Jun. 30, 2015	Mar. 31, 2015	Jan. 03, 2017	Dec. 29, 2015	Dec. 30, 2014
Selected Quarterly Financial Information [Abstract]
Revenues	$ 603,146	$ 560,018	$ 558,862	$ 553,693	$ 526,841	$ 526,688	$ 529,107	$ 517,973	$ 2,275,719	$ 2,100,609	$ 1,976,624
Income from operations	47,146	50,063	55,190	48,594	38,795	35,644	49,753	41,054	200,993	165,246	144,731
Net income	$ 32,381	$ 34,574	$ 38,585	$ 33,954	$ 27,200	$ 26,176	$ 34,724	$ 28,423	$ 139,494	$ 116,523	$ 101,276
Basic net income per share (in dollars per share)	$ 0.68	$ 0.72	$ 0.80	$ 0.70	$ 0.56	$ 0.54	$ 0.72	$ 0.58	$ 2.91	$ 2.39	$ 2.04
Diluted net income per share (in dollars per share)	0.66	0.70	0.78	0.68	0.54	0.52	0.69	0.56	2.83	2.30	1.96
Cash dividends declared per common share (in dollars per share)	$ 0.24	$ 0.24	$ 0.200	$ 0.200	$ 0.200	$ 0.200	$ 0.165	$ 0.165	$ 0.88	$ 0.73	$ 0.61

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Aggregate dividends declared during the period for each share of common stock outstanding.

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