Restatement - Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Apr. 04, 2015	Dec. 31, 2014	Mar. 29, 2014	Dec. 31, 2013	Dec. 31, 2011
Current Assets
Cash and cash equivalents	$ 32,705	$ 45,627	$ 29,415	$ 48,814
Accounts receivable (less allowance for doubtful accounts of $427 at March 29, 2014)	90,912	91,060	100,570
Inventories	141,443	142,842	148,895
Production cost of contracts	11,115	11,727	10,479
Deferred income taxes	13,783	13,783	15,340
Other current assets	19,485	23,702	22,662
Total Current Assets	309,443	328,741	327,361
Property and Equipment, Net	99,998	99,068	94,168
Goodwill	157,569	157,569	157,569
Intangibles, Net	152,596	155,104	162,875
Other Assets	6,321	7,117	9,320
Total Assets	725,927	747,599	751,293
Current Liabilities
Current portion of long-term debt	27	26	25	26
Accounts payable	58,577	58,979	53,973
Accrued liabilities	41,659	52,066	43,452
Total Current Liabilities	100,263	111,071	97,450
Long-Term Debt, Less Current Portion	280,019	290,026	325,171	290,026
Deferred Income Taxes	70,199	69,448	70,056
Other Long-Term Liabilities	19,938	20,484	18,622
Total Liabilities	470,419	491,029	511,299
Commitments and Contingencies (Notes 9, 11)
Shareholders’ Equity
Common stock - $0.01 par value; 35,000,000 shares authorized; 10,999,632 shares issued at March 29, 2014	110	110	110
Treasury stock, at cost; 143,300 shares at March 29, 2014			(1,924)
Additional paid-in capital	72,992	72,206	69,404
Retained earnings	188,932	190,905	176,197
Accumulated other comprehensive loss	(6,526)	(6,651)	(3,793)
Total Shareholders’ Equity	255,508	256,570	239,994
Total Liabilities and Shareholders’ Equity	725,927	747,599	751,293
As Reported
Current Assets
Cash and cash equivalents			29,415	48,814
Accounts receivable (less allowance for doubtful accounts of $427 at March 29, 2014)			100,570
Inventories			148,895
Production cost of contracts			10,479
Deferred income taxes			13,836
Other current assets			21,664
Total Current Assets			324,859
Property and Equipment, Net			94,168
Goodwill			161,940
Intangibles, Net			162,875
Other Assets			9,320
Total Assets			753,162
Current Liabilities
Current portion of long-term debt			25
Accounts payable			53,973
Accrued liabilities			39,628
Total Current Liabilities			93,626
Long-Term Debt, Less Current Portion			325,171
Deferred Income Taxes			70,556
Other Long-Term Liabilities			18,922
Total Liabilities			508,275
Commitments and Contingencies (Notes 9, 11)
Shareholders’ Equity
Common stock - $0.01 par value; 35,000,000 shares authorized; 10,999,632 shares issued at March 29, 2014			110
Treasury stock, at cost; 143,300 shares at March 29, 2014			(1,924)
Additional paid-in capital			71,037
Retained earnings			179,457
Accumulated other comprehensive loss			(3,793)
Total Shareholders’ Equity			244,887
Total Liabilities and Shareholders’ Equity			753,162
Adjustments
Current Assets
Cash and cash equivalents			0	0
Accounts receivable (less allowance for doubtful accounts of $427 at March 29, 2014)			0
Inventories			0
Production cost of contracts			0
Deferred income taxes			1,504
Other current assets			998
Total Current Assets			2,502
Property and Equipment, Net			0
Goodwill			(4,371)		4,000
Intangibles, Net			0
Other Assets			0
Total Assets			(1,869)
Current Liabilities
Current portion of long-term debt			0
Accounts payable			0
Accrued liabilities			3,824
Total Current Liabilities			3,824
Long-Term Debt, Less Current Portion			0
Deferred Income Taxes			(500)
Other Long-Term Liabilities			(300)
Total Liabilities			3,024
Commitments and Contingencies (Notes 9, 11)
Shareholders’ Equity
Common stock - $0.01 par value; 35,000,000 shares authorized; 10,999,632 shares issued at March 29, 2014			0
Treasury stock, at cost; 143,300 shares at March 29, 2014			0
Additional paid-in capital			(1,633)
Retained earnings			(3,260)
Accumulated other comprehensive loss			0
Total Shareholders’ Equity			(4,893)
Total Liabilities and Shareholders’ Equity			$ (1,869)