Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Cash flows from operating activities:
Net income	$ 16,191	$ 11,836
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22,763	20,962
(Gain) loss on disposition of fixed assets	30	(796)
Loss on sale of marketable securities	54	0
Unrealized loss in value of equity securities	780	0
Deferred income taxes	(905)	7,476
Changes in operating assets and liabilities:
Inventories	12,444	1,566
Accounts receivable and prepaid expenses	7,627	10,712
Accounts payable and other liabilities	(15,616)	(45,789)
Income taxes	7,021	1,948
Other	398	(110)
Net cash provided by operating activities	50,787	7,805
Cash flows from investing activities:
Purchase of property and equipment	(21,844)	(17,056)
Proceeds from the sale of property and equipment	8	1,142
Purchase of marketable securities	(586)	(2,579)
Proceeds from maturities of marketable securities	1,000	1,895
Proceeds from the sale of marketable securities	512	4,006
Purchase of intangible assets	(1,500)	(1,240)
Change in SERP investment	(933)	(1,486)
Net cash used in investing activities	(23,343)	(15,318)
Cash flows from financing activities:
Payments on long-term debt	(17,076)
Proceeds from long-term debt		6,398
Dividends paid	(8,070)	(8,070)
Net cash used in financing activities	(25,146)	(1,672)
Net increase (decrease) in cash and cash equivalents	2,298	(9,185)
Cash and cash equivalents at beginning of year	47,917	46,818
Cash and cash equivalents at end of period	$ 50,215	$ 37,633