Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 97,135	$ 183,284
Trade receivables, net	71,582	75,144
Contract assets	112,845
Other receivables	14,824	20,891
Inventories, net	103,648	138,542
Prepaid expenses and other current assets	16,776	4,217
Total current assets	416,810	422,078
Property, plant and equipment, net	352,947	254,299
Goodwill	271,424	43,626
Intangible assets, net	191,959	13,868
Deferred income taxes	11,557	3,198
Other non-current assets	3,192	3,496
Total assets	1,247,889	740,565
Current liabilities:
Accounts payable	38,205	35,017
Contract liabilities, current	10,269	4,707
Taxes payable	2,727	43
Accrued expenses and other current liabilities	40,578	42,774
Total current liabilities	91,779	82,541
Long-term debt	325,000
Contract liabilities, non-current	43,379	39,000
Deferred income taxes	66,231	7,806
Accrued pension benefits	38,429	41,141
Other non-current liabilities	23,793	25,213
Total liabilities	588,611	195,701
Stockholders' equity:
Common stock, $.10 par value; authorized 100,000,000, issued 34,813,949 and 34,270,975 shares at respective dates	3,481	3,427
Additional paid-in capital	181,435	165,979
Retained earnings	537,251	429,826
Treasury stock, at cost, 1,273,888 and 1,424,153 shares at respective dates	(10,860)	(12,140)
Accumulated other comprehensive loss	(52,029)	(42,228)
Total stockholders' equity	659,278	544,864
Total liabilities and stockholders' equity	$ 1,247,889	$ 740,565