Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 26, 2016	Mar. 28, 2015
Cash flows provided by operating activities:
Net Income	$ 7,032	$ 13,743
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,029	10,312
Loss on disposal of property, plant and equipment	303	335
Bad debt recovery	(33)	(42)
Stock-based compensation expense	2,686	1,621
Excess tax benefit from stock-based compensation arrangements	(3,839)	(12,538)
Deferred income taxes	351	(5)
Changes in operating assets and liabilities:
Accounts receivable	(6,166)	(7,444)
Inventories	(5,275)	(4,489)
Prepaid expenses, income tax receivable and other assets	8,165	29,535
Accounts payable	825	2,138
Accrued expenses and other current liabilities	(8,282)	(12,108)
Other liabilities	(1,529)	167
Net cash provided by operating activities	6,267	21,225
Cash flows used in investing activities:
Purchases of property, plant and equipment	(13,011)	(18,688)
Cash paid for acquisition of intangible assets		(100)
Decrease in restricted cash	56	57
Net cash used in investing activities	(12,955)	(18,731)
Cash flows (used in) provided by financing activities:
Repurchase of Class A Common Stock	(60,775)	(9,490)
Proceeds from exercise of stock options	20,347	39,745
Cash paid on note payable	(58)	(54)
Excess tax benefit from stock-based compensation arrangements	3,839	12,538
Net proceeds from sale of investment shares	270	521
Net cash (used in) provided by financing activities	(36,377)	43,260
Change in cash and cash equivalents	(43,065)	45,754
Cash and cash equivalents at beginning of year	94,193	76,402
Cash and cash equivalents at end of period	51,128	122,156
Supplemental disclosure of cash flow information:
Income taxes paid	1,963	417
Income taxes refunded	12,000	17,252
Increase in accounts payable for purchase of property, plant and equipment	$ 1,628	$ 1,647