Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 6,381	$ 10,263
Restricted cash	361	0
Accounts receivable, net of allowance for doubtful accounts of $896 and $1,135 at September 28, 2019 and December 31, 2018, respectively	77,002	67,819
Contract assets	102,475	86,665
Inventories	109,848	101,125
Production cost of contracts	10,704	11,679
Other current assets	5,947	6,531
Total Current Assets	312,718	284,082
Property and equipment, net of accumulated depreciation of $164,907 and $154,840 at September 28, 2019 and December 31, 2018, respectively	112,597	107,045
Operating lease right-of-use assets	18,602
Goodwill	136,057	136,057
Intangibles, net	103,977	112,092
Non-current deferred income taxes	313	308
Other assets	5,290	5,155
Total Assets	689,554	644,739
Current Liabilities
Accounts payable	78,310	69,274
Contract liabilities	11,850	17,145
Accrued and other liabilities	37,701	37,786
Operating lease liabilities	2,915
Current portion of long-term debt	2,281	2,330
Total Current Liabilities	133,057	126,535
Long-term debt	222,600	228,868
Non-current operating lease liabilities	17,156
Non-current deferred income taxes	18,107	18,070
Other long-term liabilities	14,855	14,441
Total Liabilities	405,775	387,914
Commitments and contingencies (Notes 10, 12)
Shareholders’ Equity
Common stock - $0.01 par value; 35,000,000 shares authorized; 11,561,987 and 11,417,863 shares issued and outstanding at September 28, 2019 and December 31, 2018, respectively	116	114
Additional paid-in capital	86,828	83,712
Retained earnings	203,682	180,356
Accumulated other comprehensive loss	(6,847)	(7,357)
Total Shareholders’ Equity	283,779	256,825
Total Liabilities and Shareholders’ Equity	$ 689,554	$ 644,739