CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 375,172	$ 345,955
Trade receivables, net	102,715	116,202
Unbilled receivables	114,357	140,318
Inventories, net	194,720	212,536
Prepaids and other current assets	40,307	48,182
Total current assets	827,271	863,193
Operating lease right of use assets	5,284	6,962
Property, plant and equipment, net	224,676	234,823
Deferred income taxes	5,965	5,768
Intangible assets	27,137	29,434
Other assets	3,404	10,992
Total assets	1,093,737	1,151,172
Current liabilities:
Accounts payable	40,007	37,424
Accrued income taxes	1,687	4,343
Contract liabilities	5,585	11,339
Accrued compensation	7,414	5,015
Operating lease liabilities	881	1,110
Other accrued liabilities	36,252	26,281
Total current liabilities	91,826	85,512
Deferred income taxes	6,194	6,779
Income tax payable	9,525	9,383
Operating lease liabilities, long-term	4,414	5,845
Other long-term liabilities	2,001	2,125
Total liabilities	113,960	109,644
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, 35,385,885 and 35,417,712 shares issued and outstanding at September 30, 2021 and December 31, 2020	363	363
Additional paid-in capital	75,154	65,613
Retained earnings	1,059,563	1,125,263
Accumulated other comprehensive losses	(155,303)	(149,711)
Total stockholders' equity	979,777	1,041,528
Total liabilities and stockholders' equity	$ 1,093,737	$ 1,151,172