CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Cash flows from operating activities:
Net income	$ 278,722	$ 220,960
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	86,397	80,774
Loss on disposition of property and equipment	623	198
Share-based compensation expense	16,409	15,079
Deferred income taxes	(2,247)	(7,742)
Change in assets and liabilities:
Inventories	(179,072)	(98,598)
Prepaid expenses and other current assets	(15,127)	148
Accounts payable	73,097	(8,702)
Accrued employee compensation	(8,915)	(10,982)
Other accrued expenses	(3,884)	(33,895)
Income taxes	23,870	67,289
Other	4,141	2,979
Net cash provided by operating activities	274,014	227,508
Cash flows from investing activities:
Capital expenditures	(116,695)	(96,610)
Proceeds from sale of property and equipment	288	10,781
Net cash used in investing activities	(116,407)	(85,829)
Cash flows from financing activities:
Borrowings under debt facilities	673,000	578,000
Repayments under debt facilities	(557,500)	(398,000)
Debt issuance costs	(346)	(313)
Principal payments under capital lease obligations	(1,809)	(669)
Repurchase of shares to satisfy tax obligations	(569)	(653)
Repurchase of common stock	(252,545)	(248,147)
Net proceeds from issuance of common stock	14,345	7,835
Cash dividends paid to stockholders	(71,377)	(65,855)
Net cash used in financing activities	(196,801)	(127,802)
Net change in cash and cash equivalents	(39,194)	13,877
Cash and cash equivalents at beginning of period	109,148	53,916
Cash and cash equivalents at end of period	69,954	67,793
Cash paid during the period for:
Interest	6,337	5,218
Income taxes	58,949	67,752
Supplemental disclosures of non-cash activities:
Property and equipment acquired through capital lease	0	10,734
Non-cash accruals for construction in progress	$ 16,227	$ 15,377