Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Cash Flows from Operating Activities:
Net income	$ 106,049	$ 92,329	$ 89,987
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation, amortization and accretion	18,907	16,186	12,658
Provision for doubtful accounts	1,221	3,260	308
Benefit from deferred income tax	(4,888)	(5,106)	(632)
Provision for non-cash stock compensation	2,380	882	1,146
Changes in assets and liabilities:
Accounts receivable	(27,824)	(1,148)	(25,566)
Inventories	24,874	(20,202)	(13,136)
Prepaids and other current assets	(790)	821	(522)
Other assets	(4,590)	(3,962)	(6,757)
Accounts payable	8,662	5,389	(1,558)
Accrued compensation and other liabilities	(2,462)	3,611	3,712
Cash provided by operating activities	121,539	92,060	59,640
Cash Flows from Investing Activities:
Property, plant and equipment additions	(20,059)	(21,688)	(29,862)
Purchase of equity investment	(6,195)	(2,133)
Cash used in investing activities	(26,254)	(23,821)	(29,862)
Cash Flows from Financing Activities:
Proceeds from exercise of stock options		93	463
Other stock related activity	(145)	(5)	343
Purchase and cancellation of common stock	(24,678)	(37,324)	(43,521)
Cash used in financing activities	(24,823)	(37,236)	(42,715)
Net Increase (Decrease) in Cash and Cash Equivalents	70,462	31,003	(12,937)
Cash and Cash Equivalents, Beginning of Period	78,659	47,656	60,593
Cash and Cash Equivalents, End of Period	149,121	78,659	47,656
Supplemental Cash Flow Information
Cash paid for interest expense	266	281	234
Cash paid for income taxes	$ 62,348	$ 57,151	$ 46,540