CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 398,946	$ 418,100
Trade receivables, net	107,626	118,663
Unbilled receivables	140,534	83,502
Inventories, net	205,062	191,194
Prepaids and other current assets	28,321	41,522
Total current assets	880,489	852,981
Operating lease right of use assets	5,144
Property, plant and equipment, net	258,497	274,123
Deferred income taxes	8,936	7,995
Goodwill	7,947	7,714
Intangible assets	32,245	34,974
Other assets	13,307	14,723
Total assets	1,206,565	1,192,510
Current liabilities:
Accounts payable	46,324	26,693
Accrued income taxes	4,561	3,138
Contract liabilities	6,901	9,648
Accrued compensation	13,599	10,537
Operating lease liabilities	1,314
Other accrued liabilities	24,241	31,523
Total current liabilities	96,940	81,539
Deferred income taxes	4,150	2,466
Income tax payable	8,868	9,623
Operating lease liabilities, long-term	3,801
Other long-term liabilities	2,105	2,720
Total liabilities	115,864	96,348
Contingencies (Note 15)
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 at December 31, 2019 and 2018, 35,859,540 and 36,264,001 issued and outstanding at December 31, 2019 and 2018	371	376
Additional paid-in capital	52,870	34,953
Retained earnings	1,181,023	1,205,946
Accumulated other comprehensive losses	(143,563)	(145,113)
Total stockholders' equity	1,090,701	1,096,162
Total liabilities and stockholders' equity	$ 1,206,565	$ 1,192,510