Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Cash flows from operating activities:
Net income	$ 35,286	$ 30,311
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	46,137	42,160
(Gain) loss on disposition of fixed assets	157	(1,034)
Loss on sale of marketable securities	54	0
Unrealized loss in value of equity securities	1,238	0
Deferred income taxes	1,379	5,757
Changes in operating assets and liabilities:
Inventories	6,093	9,706
Accounts receivable and prepaid expenses	5,436	15,371
Accounts payable and other liabilities	(20,538)	(40,409)
Income taxes	8,429	910
Other	556	490
Net cash provided by operating activities	84,227	63,262
Cash flows from investing activities:
Purchase of property and equipment	(46,367)	(40,334)
Proceeds from the sale of property and equipment	321	2,106
Purchase of marketable securities	(586)	(6,788)
Proceeds from maturities of marketable securities	2,800	5,802
Proceeds from the sale of marketable securities	514	4,806
Purchase of intangible assets	(1,662)	(1,267)
Change in SERP investment	(1,414)	(2,052)
Net cash used in investing activities	(46,394)	(37,727)
Cash flows from financing activities:
Payments on long-term debt	(34,988)	(12,525)
Dividends paid	(16,139)	(16,139)
Net cash used in financing activities	(51,127)	(28,664)
Net decrease in cash and cash equivalents	(13,294)	(3,129)
Cash and cash equivalents at beginning of year	47,917	46,818
Cash and cash equivalents at end of period	$ 34,623	$ 43,689