CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 269,516	$ 258,390
Short-term investments	2,859	4,825
Accounts receivable, net of allowances of $4,855 and $4,866 at March 31, 2020 and December 31, 2019, respectively	243,746	260,322
Inventories	232,184	236,472
Prepaid expenses and other	48,141	49,950
Total current assets	796,446	809,959
Property, plant and equipment, net	456,122	469,574
Deferred income tax	16,994	17,516
Goodwill	149,666	141,318
Intangible assets, net	121,218	119,523
Other long-term assets	79,820	81,494
Total assets	1,620,266	1,639,384
Current liabilities:
Line of credit	13,397	13,342
Accounts payable	112,075	122,148
Accrued liabilities and other	88,327	100,571
Income tax payable	15,642	16,156
Current portion of long-term debt	34,676	33,105
Total current liabilities	264,117	285,322
Long-term debt, net of current portion	46,011	64,401
Deferred tax liabilities	16,348	16,333
Other long-term liabilities	111,501	120,545
Total liabilities	437,977	486,601
Commitments and contingencies (See Note 8)
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; 51,450,808 and 51,206,969, issued and outstanding at March 31, 2020 and December 31, 2019, respectively	35,289	35,111
Additional paid-in capital	427,543	427,262
Retained earnings	810,126	789,958
Treasury stock at cost, 1,480,840 and 1,457,206, issued and outstanding at March 31, 2020 and December 31, 2019, respectively	(38,457)	(37,768)
Accumulated other comprehensive loss	(109,472)	(108,139)
Total stockholders' equity	1,125,029	1,106,424
Noncontrolling interest	57,260	46,359
Total equity	1,182,289	1,152,783
Total liabilities and stockholders' equity	$ 1,620,266	$ 1,639,384