Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014
Cash flows from operating activities
Net income	$ 68,789	$ 63,884
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	32,816	26,071
Accretion of asset retirement obligation and closed facility reserve	178	83
Amortization of financing fees and debt issuance costs	501	785
Loss on disposal of property and equipment	405	994
Equity-based compensation	2,434	2,995
Loss on extinguishment of debt	5,481
Deferred income taxes	1,620	11,025
Changes in operating assets and liabilities:
Accounts receivable	(4,874)	(1,860)
Inventories	(15,386)	(16,399)
Prepaid expenses and other current assets	2,220	5,524
Other assets	(6,149)	(636)
Accounts payable	26,527	34,012
Accrued salaries and benefits	(7,694)	859
Other accrued liabilities and income taxes payable	(2,079)	594
Other long-term liabilities	16,151	9,958
Net cash provided by operating activities	120,940	137,889
Cash flows from investing activities
Purchases of property and equipment	(74,541)	(57,793)
Proceeds from sale of property and equipment	2	115
Net cash used in investing activities	(74,539)	(57,678)
Cash flows from financing activities
Proceeds from revolving credit facility	260,000
Payments on revolving credit facility	(100,000)
Payments on term loan	(261,250)	(3,500)
Payments on capital lease obligations	(316)	(244)
Payments on financing lease obligations	(1,700)	(1,423)
Payments of deferred financing costs	(1,896)
Cash from landlord related to financing lease obligations		577
Excess tax benefit for exercise of stock options	19,288	26,214
Proceeds from the exercise of stock options	6,218	4,786
Net cash (used in) provided by financing activities	(79,656)	26,410
Net (decrease) increase in cash and cash equivalents	(33,255)	106,621
Cash and cash equivalents at beginning of the period	130,513	77,652
Cash and cash equivalents at the end of the period	97,258	184,273
Supplemental disclosure of cash flow information
Cash paid for interest	10,575	12,183
Cash paid for income taxes	19,058	531
Supplemental disclosure of non-cash investing and financing activities
Property and equipment in accounts payable	12,662	21,969
Property acquired through capital and financing lease obligations	$ 5,373	$ 5,746