CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 290,279	$ 355,451
Short term investments	25,287	0
Trade receivables, net	81,666	100,987
Unbilled receivables	138,533	102,597
Inventories, net	140,530	145,724
Prepaids and other current assets	49,457	40,790
Total	20,006	0
Total current assets	745,758	745,549
Operating lease right of use assets	4,932	5,258
Property, plant and equipment, net	181,359	216,200
Deferred income taxes	8,893	11,381
Intangible assets	23,868	26,446
Other assets	5,714	5,592
Total assets	970,524	1,010,426
Current liabilities:
Accounts payable	46,484	35,232
Accrued income taxes	2,106	4,102
Contract liabilities	8,859	9,746
Accrued compensation	8,420	6,291
Operating lease liabilities	1,007	1,046
Other accrued liabilities	22,411	37,246
Total current liabilities	89,287	93,663
Deferred income taxes	3,918	3,925
Income tax payable	6,501	9,627
Operating lease liabilities, long-term	3,817	4,170
Other long-term liabilities	2,164	1,933
Total liabilities	105,687	113,318
Contingencies (Note 12)
Stockholders' equity:
Preferred stock: 10,000,000 shares authorized at $0.01 par value (none issued)	0	0
Common stock:
100,000,000 shares authorized at $0.01 par value, 33,919,726 and 34,774,156 shares issued and outstanding at September 30, 2022 and December 31, 2021	343	352
Additional paid-in capital	87,917	80,254
Retained earnings	952,991	973,087
Accumulated other comprehensive losses	(176,414)	(156,585)
Total stockholders' equity	864,837	897,108
Total liabilities and stockholders' equity	$ 970,524	$ 1,010,426