Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current Assets
Cash and cash equivalents	$ 3,532	$ 2,150
Accounts receivable, net of allowance for doubtful accounts of $838 and $868 at June 30, 2018 and December 31, 2017, respectively	64,439	74,064
Contract assets	81,663	0
Inventories	95,244	122,161
Production cost of contracts	10,719	11,204
Other current assets	12,638	11,435
Total Current Assets	268,235	221,014
Property and equipment, net of accumulated depreciation of $155,069 and $143,216 at June 30, 2018 and December 31, 2017, respectively	106,636	110,252
Goodwill	136,051	117,435
Intangibles, net	117,485	114,693
Non-current deferred income taxes	130	261
Other assets	3,356	3,098
Total Assets	631,893	566,753
Current Liabilities
Accounts payable	71,660	51,907
Contract liabilities	15,164	0
Accrued liabilities	25,813	28,329
Total Current Liabilities	112,637	80,236
Long-term debt	231,159	216,055
Non-current deferred income taxes	19,947	15,981
Other long-term liabilities	18,149	18,898
Total Liabilities	381,892	331,170
Commitments and contingencies (Notes 11, 13)
Shareholders’ Equity
Common stock - $0.01 par value; 35,000,000 shares authorized; 11,401,525 and 11,332,841 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively	114	113
Additional paid-in capital	81,331	80,223
Retained earnings	175,243	161,364
Accumulated other comprehensive loss	(6,687)	(6,117)
Total Shareholders’ Equity	250,001	235,583
Total Liabilities and Shareholders’ Equity	$ 631,893	$ 566,753