CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 320,784	$ 355,451
Trade receivables, net	85,293	100,987
Unbilled receivables	131,031	102,597
Inventories, net	139,794	145,724
Prepaids and other current assets	50,378	40,790
Total	20,583	0
Total current assets	747,863	745,549
Operating lease right of use assets	4,860	5,258
Property, plant and equipment, net	179,938	216,200
Deferred income taxes	10,237	11,381
Intangible assets	24,785	26,446
Other assets	5,883	5,592
Total assets	973,566	1,010,426
Current liabilities:
Accounts payable	46,267	35,232
Accrued income taxes	2,405	4,102
Contract liabilities	7,279	9,746
Accrued compensation	6,457	6,291
Operating lease liabilities	943	1,046
Other accrued liabilities	21,505	37,246
Total current liabilities	84,856	93,663
Deferred income taxes	4,234	3,925
Income tax payable	9,841	9,627
Operating lease liabilities, long-term	3,865	4,170
Other long-term liabilities	2,081	1,933
Total liabilities	104,877	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, 34,373,909 and 34,774,156 shares issued and outstanding at June 30, 2022 and December 31, 2021	348	352
Additional paid-in capital	85,351	80,254
Retained earnings	948,917	973,087
Accumulated other comprehensive losses	(165,927)	(156,585)
Total stockholders' equity	868,689	897,108
Total liabilities and stockholders' equity	$ 973,566	$ 1,010,426