Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jul. 04, 2015	Dec. 31, 2014	Jun. 28, 2014	Dec. 31, 2013
Current Assets
Cash and cash equivalents	$ 26,842	$ 45,627	$ 43,751	$ 48,814
Accounts receivable, net of allowance for doubtful accounts of $223 and $252 at July 4, 2015 and December 31, 2014, respectively	91,194	91,060	105,209
Inventories	138,014	142,842	142,201
Production cost of contracts	9,772	11,727	11,023
Deferred income taxes	12,371	13,783	12,929
Other current assets	16,835	23,702	21,600
Total Current Assets	295,028	328,741	336,713
Property and equipment, net of accumulated depreciation of $133,679 and $128,457 at July 4, 2015 and December 31, 2014, respectively	99,347	99,068	94,070
Goodwill	157,569	157,569	157,569
Intangibles, net	150,088	155,104	160,285
Other assets	7,938	7,117	8,660
Total Assets	709,970	747,599	757,297
Current Liabilities
Current portion of long-term debt	27	26	26	26
Accounts payable	55,313	58,979	53,749
Accrued liabilities	41,901	52,066	51,562
Total Current Liabilities	97,241	111,071	105,337
Long-term debt, less current portion	265,012	290,026	317,664	$ 290,026
Deferred income taxes	69,613	69,448	69,247
Other long-term liabilities	19,583	20,484	17,156
Total Liabilities	$ 451,449	$ 491,029	$ 509,404
Commitments and contingencies (Notes 9, 11)
Shareholders’ Equity
Common stock - $0.01 par value; 35,000,000 shares authorized; 11,082,460 and 10,952,268 issued at July 4, 2015 and December 31, 2014, respectively	$ 111	$ 110	$ 109
Additional paid-in capital	74,069	72,206	68,704
Retained earnings	190,714	190,905	182,816
Accumulated other comprehensive loss	(6,373)	(6,651)	(3,736)
Total Shareholders’ Equity	258,521	256,570	247,893
Total Liabilities and Shareholders’ Equity	$ 709,970	$ 747,599	$ 757,297