CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 359,171	$ 398,946
Trade receivables, net	93,502	107,626
Unbilled receivables	145,349	140,534
Inventories, net	219,007	205,062
Prepaids and other current assets	45,973	28,321
Total current assets	863,002	880,489
Operating lease right of use assets	7,221	5,144
Property, plant and equipment, net	239,591	258,497
Deferred income taxes	9,325	8,936
Goodwill		7,947
Intangible assets	29,895	32,245
Other assets	10,505	13,307
Total assets	1,159,539	1,206,565
Current liabilities:
Accounts payable	51,186	46,324
Accrued income taxes	6,783	4,561
Contract liabilities	7,134	6,901
Accrued compensation	8,290	13,599
Operating lease liabilities	1,257	1,314
Other accrued liabilities	26,332	24,241
Total current liabilities	100,982	96,940
Deferred income taxes	3,657	4,150
Income tax payable	9,253	8,868
Operating lease liabilities, long-term	5,952	3,801
Other long-term liabilities	2,133	2,105
Total liabilities	121,977	115,864
Contingencies (Note 12)
Stockholders' equity:
Preferred stock: 10,000,000 shares authorized at $0.01 par value (none issued)
Common stock:
100,000,000 shares authorized at $0.01 par value, 35,093,933 and 35,859,540 shares issued and outstanding at September 30, 2020 and December 31, 2019	363	371
Additional paid-in capital	62,331	52,870
Retained earnings	1,136,517	1,181,023
Accumulated other comprehensive losses	(161,649)	(143,563)
Total stockholders' equity	1,037,562	1,090,701
Total liabilities and stockholders' equity	$ 1,159,539	$ 1,206,565