CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 258,390	$ 241,053
Short-term investments	4,825	7,499
Accounts receivable, net of allowances of $4,866 and $4,102 at December 31, 2019 and 2018, respectively	260,322	228,405
Inventories	236,472	215,435
Prepaid expenses and other current assets	49,950	42,446
Total current assets	809,959	734,838
Property, plant and equipment, net	469,574	446,835
Deferred income tax	17,516	31,652
Goodwill	141,318	132,437
Intangible assets, net	119,523	137,935
Other long-term assets	81,494	42,674
Total assets	1,639,384	1,526,371
Current liabilities:
Line of credit	13,342	10,254
Accounts payable	122,148	117,808
Accrued liabilities	100,571	82,605
Income tax payable	16,156	15,744
Current portion of long-term debt	33,105	27,613
Total current liabilities	285,322	254,024
Long-term debt, net of current portion	64,401	186,143
Deferred tax liabilities	16,333	17,993
Other long-term liabilities	120,545	90,779
Total liabilities	486,601	548,939
Commitments and contingencies (See Note 17)
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; 51,206,969 and 50,221,035, issued and outstanding at December 31, 2019 and 2018, respectively	35,111	34,454
Additional paid-in capital	427,262	399,915
Retained earnings	789,958	636,708
Treasury stock, at cost, 1,457,206 shares held at December 31, 2019 and 2018	(37,768)	(37,768)
Accumulated other comprehensive loss	(108,139)	(101,846)
Total stockholders' equity	1,106,424	931,463
Noncontrolling interest	46,359	45,969
Total equity	1,152,783	977,432
Total liabilities and stockholders' equity	$ 1,639,384	$ 1,526,371