CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 276,253	$ 268,065
Restricted cash	54,848	52,464
Short-term investments	8,366	6,142
Accounts receivable, net of allowances of $3,442 and $3,806 at March 31, 2021 and December 31, 2020, respectively	332,209	320,061
Inventories	289,972	307,062
Prepaid expenses and other	88,703	70,193
Total current assets	1,050,351	1,023,987
Property, plant and equipment, net	510,467	530,815
Deferred income tax	51,820	57,841
Goodwill	158,583	158,331
Intangible assets, net	106,570	110,591
Other long-term assets	112,551	97,892
Total assets	1,990,342	1,979,457
Current liabilities:
Lines of credit	67,624	140,563
Accounts payable	172,172	168,045
Accrued liabilities and other	159,486	160,117
Income tax payable	15,203	19,177
Current portion of long-term debt	18,353	21,860
Total current liabilities	432,838	509,762
Long-term debt, net of current portion	327,007	288,179
Deferred tax liabilities	34,561	34,598
Other long-term liabilities	138,956	130,795
Total liabilities	933,362	963,334
Commitments and contingencies (See Note 9)
Stockholders' equity
Preferred stock - par value $1.00 per share; 1,000,000 shares authorized; no shares issued or outstanding
Common stock - par value $0.66 2/3 per share; 70,000,000 shares authorized; 44,600,001 and 44,276,194, issued and outstanding at March 31, 2021 and December 31, 2020, respectively	35,908	35,692
Additional paid-in capital	446,697	449,598
Retained earnings	927,498	888,046
Treasury stock at cost, 9,259,858 shares at March 31, 2021 and December 31, 2020	(335,910)	(335,910)
Accumulated other comprehensive loss	(71,624)	(73,606)
Total stockholders' equity	1,002,569	963,820
Noncontrolling interest	54,411	52,303
Total equity	1,056,980	1,016,123
Total liabilities and stockholders' equity	$ 1,990,342	$ 1,979,457