Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 29, 2018	Dec. 31, 2017
Current Assets
Cash and cash equivalents	$ 3,573	$ 2,150
Accounts receivable, net of allowance for doubtful accounts of $1,212 and $868 at September 29, 2018 and December 31, 2017, respectively	64,466	74,064
Contract assets	88,066	0
Inventories	101,752	122,161
Production cost of contracts	12,021	11,204
Other current assets	12,124	11,435
Total Current Assets	282,002	221,014
Property and equipment, net of accumulated depreciation of $159,010 and $143,216 at September 29, 2018 and December 31, 2017, respectively	106,583	110,252
Goodwill	135,769	117,435
Intangibles, net	114,746	114,693
Non-current deferred income taxes	131	261
Other assets	3,334	3,098
Total Assets	642,565	566,753
Current Liabilities
Accounts payable	73,534	51,907
Contract liabilities	15,108	0
Accrued liabilities	31,929	28,329
Total Current Liabilities	120,571	80,236
Long-term debt	229,402	216,055
Non-current deferred income taxes	19,427	15,981
Other long-term liabilities	17,608	18,898
Total Liabilities	387,008	331,170
Commitments and contingencies (Notes 11, 13)
Shareholders’ Equity
Common stock - $0.01 par value; 35,000,000 shares authorized; 11,409,623 and 11,332,841 shares issued and outstanding at September 29, 2018 and December 31, 2017, respectively	114	113
Additional paid-in capital	82,447	80,223
Retained earnings	179,412	161,364
Accumulated other comprehensive loss	(6,416)	(6,117)
Total Shareholders’ Equity	255,557	235,583
Total Liabilities and Shareholders’ Equity	$ 642,565	$ 566,753