CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 355,451	$ 345,955
Trade receivables, net	100,987	116,202
Unbilled receivables	102,597	140,318
Inventories, net	145,724	212,536
Prepaids and other current assets	40,790	48,182
Total current assets	745,549	863,193
Operating lease right of use assets	5,258	6,962
Property, plant and equipment, net	216,200	234,823
Deferred income taxes	11,381	5,768
Intangible assets	26,446	29,434
Other assets	5,592	10,992
Total assets	1,010,426	1,151,172
Current liabilities:
Accounts payable	35,232	37,424
Accrued income taxes	4,102	4,343
Contract liabilities	9,746	11,339
Accrued compensation	6,291	5,015
Operating lease liabilities	1,046	1,110
Other accrued liabilities	37,246	26,281
Total current liabilities	93,663	85,512
Deferred income taxes	3,925	6,779
Income tax payable	9,627	9,383
Operating lease liabilities, long-term	4,170	5,845
Other long-term liabilities	1,933	2,125
Total liabilities	113,318	109,644
Contingencies (Note 15)
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, 34,774,156 and 35,417,712 shares issued and outstanding at December 31, 2021 and December 31, 2020	352	363
Additional paid-in capital	80,254	65,613
Retained earnings	973,087	1,125,263
Accumulated other comprehensive losses	(156,585)	(149,711)
Total stockholders' equity	897,108	1,041,528
Total liabilities and stockholders' equity	$ 1,010,426	$ 1,151,172