Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Oct. 03, 2015	Dec. 31, 2014	Sep. 27, 2014	Dec. 31, 2013
Current Assets
Cash and cash equivalents	$ 12,241	$ 45,627	$ 40,852	$ 48,814
Accounts receivable, net of allowance for doubtful accounts of $241 and $252 at October 3, 2015 and December 31, 2014, respectively	86,235	91,060	104,396
Inventories	137,317	142,842	145,468
Production cost of contracts	11,609	11,727	10,375
Deferred income taxes	12,432	13,783	15,185
Other current assets	22,700	23,702	21,930
Total Current Assets	282,534	328,741	338,206
Property and equipment, net of accumulated depreciation of $137,556 and $128,457 at October 3, 2015 and December 31, 2014, respectively	98,335	99,068	93,181
Goodwill	157,569	157,569	157,569
Intangibles, net	147,580	155,104	157,694
Other assets	6,383	7,117	7,657
Total Assets	692,401	747,599	754,307
Current Liabilities
Current portion of long-term debt	2,215	26	26	26
Accounts payable	50,852	58,979	55,083
Accrued liabilities	43,434	52,066	46,787
Total Current Liabilities	96,501	111,071	101,896
Long-term debt, less current portion	257,820	290,026	310,157	$ 290,026
Deferred income taxes	69,696	69,448	72,578
Other long-term liabilities	18,913	20,484	16,558
Total Liabilities	$ 442,930	$ 491,029	$ 501,189
Commitments and contingencies (Notes 10, 12)
Shareholders’ Equity
Common stock - $0.01 par value; 35,000,000 shares authorized; 11,083,369 and 10,952,268 issued at October 3, 2015 and December 31, 2014, respectively	$ 111	$ 110	$ 109
Additional paid-in capital	74,395	72,206	70,930
Retained earnings	181,199	190,905	185,749
Accumulated other comprehensive loss	(6,234)	(6,651)	(3,670)
Total Shareholders’ Equity	249,471	256,570	253,118
Total Liabilities and Shareholders’ Equity	$ 692,401	$ 747,599	$ 754,307