Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 29, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 3,287	$ 10,263
Restricted cash	757	0
Accounts receivable, net of allowance for doubtful accounts of $744 and $1,135 at June 29, 2019 and December 31, 2018, respectively	69,355	67,819
Contract assets	100,527	86,665
Inventories	109,327	101,125
Production cost of contracts	11,298	11,679
Other current assets	5,929	6,531
Total Current Assets	300,480	284,082
Property and equipment, net of accumulated depreciation of $161,655 and $154,840 at June 29, 2019 and December 31, 2018, respectively	111,373	107,045
Operating lease right-of-use assets	19,148
Goodwill	136,057	136,057
Intangibles, net	106,710	112,092
Non-current deferred income taxes	313	308
Other assets	5,514	5,155
Total Assets	679,595	644,739
Current Liabilities
Accounts payable	79,279	69,274
Contract liabilities	13,183	17,145
Accrued and other liabilities	33,349	37,786
Operating lease liabilities	2,858
Current portion of long-term debt	2,281	2,330
Total Current Liabilities	130,950	126,535
Long-term debt	225,605	228,868
Non-current operating lease liabilities	17,911
Non-current deferred income taxes	18,175	18,070
Other long-term liabilities	14,724	14,441
Total Liabilities	407,365	387,914
Commitments and contingencies (Notes 10, 12)
Shareholders’ Equity
Common stock - $0.01 par value; 35,000,000 shares authorized; 11,526,138 and 11,417,863 shares issued and outstanding at June 29, 2019 and December 31, 2018, respectively	115	114
Additional paid-in capital	83,844	83,712
Retained earnings	195,379	180,356
Accumulated other comprehensive loss	(7,108)	(7,357)
Total Shareholders’ Equity	272,230	256,825
Total Liabilities and Shareholders’ Equity	$ 679,595	$ 644,739