Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Mar. 26, 2016
Cash flows (used in) provided by operating activities:
Net income	$ 5,711	$ 7,032
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	12,724	12,029
Loss on disposal of property, plant and equipment	27	303
Bad debt expense (recovery)	4	(33)
Stock-based compensation expense	1,581	2,686
Excess tax benefit from stock-based compensation arrangements	0	(3,839)
Deferred income taxes	117	351
Changes in operating assets and liabilities:
Accounts receivable	1,376	(6,166)
Inventories	(4,799)	(5,275)
Prepaid expenses, income tax receivable and other assets	(2,784)	8,165
Accounts payable	(6,254)	3,825
Accrued expenses and other current liabilities	(12,595)	(8,282)
Other liabilities	(148)	(1,529)
Net cash (used in) provided by operating activities	(5,040)	9,267
Cash flows used in investing activities:
Purchases of property, plant and equipment	(6,981)	(13,011)
Proceeds from disposal of property, plant and equipment	7	0
Decrease in restricted cash	16	56
Net cash used in investing activities	(6,958)	(12,955)
Cash flows used in financing activities:
Repurchase of Class A Common Stock	(33,268)	(63,775)
Proceeds from exercise of stock options	13,869	20,347
Cash paid on note payable	(60)	(58)
Excess tax benefit from stock-based compensation arrangements	0	3,839
Net proceeds from sale of investment shares	315	270
Net cash used in financing activities	(19,144)	(39,377)
Change in cash and cash equivalents	(31,142)	(43,065)
Cash and cash equivalents at beginning of year	91,035	94,193
Cash and cash equivalents at end of period	59,893	51,128
Supplemental disclosure of cash flow information:
Income taxes paid	225	1,963
Income taxes refunded	2	12,000
Increase in accounts payable for purchase of property, plant and equipment	1,741	1,628
Decrease in accounts payable for repurchase of Class A Common Stock	$ 0	$ (3,000)