CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 414,808	$ 418,100
Trade receivables, net	208,156	202,165
Inventories, net	194,547	191,194
Prepaids and other current assets	25,829	41,522
Total current assets	843,340	852,981
Operating lease right of use assets	4,401
Property, plant and equipment, net	270,424	274,123
Deferred income taxes	7,843	7,995
Goodwill	7,780	7,714
Intangible assets	34,474	34,974
Other assets	15,467	14,723
Total assets	1,183,729	1,192,510
Current liabilities:
Accounts payable	20,655	26,693
Accrued income taxes	3,970	3,138
Customer prepayments	12,834	9,648
Accrued compensation	8,446	10,537
Operating lease liabilities	1,176
Other accrued liabilities	23,648	32,242
Total current liabilities	70,729	82,258
Deferred income taxes	2,332	2,466
Income tax payable	9,678	9,623
Operating lease liabilities, long-term	3,189
Other long-term liabilities	2,396	2,001
Total liabilities	88,324	96,348
Commitments and contingencies (Note 13)
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, 36,212,740 and 36,264,001 shares issued and outstanding at March 31, 2019 and December 31, 2018	376	376
Additional paid-in capital	39,815	34,953
Retained earnings	1,198,700	1,205,946
Accumulated other comprehensive losses	(143,486)	(145,113)
Total stockholders' equity	1,095,405	1,096,162
Total liabilities and stockholders' equity	$ 1,183,729	$ 1,192,510