Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 315,949	$ 344,781	[1]
Short-term investment securities	20,845	37,329	[1]
TOTAL CASH, CASH EQUIVALENTS AND INVESTMENT SECURITIES	336,794	382,110	[1]
Accounts receivable, net of allowance for doubtful accounts of $7,852 at March 31, 2019 and $5,768 at December 31, 2018	210,449	176,298	[1]
Inventories	343,715	311,163	[1]
Prepaid income taxes	19,724	11,348	[1]
Prepaid expenses and other current assets	33,807	46,117	[1]
TOTAL CURRENT ASSETS	944,489	927,036	[1]
PROPERTY AND EQUIPMENT, net	444,087	432,641	[1]
Operating Lease, Right-of-Use Asset	35,787	0	[1]
LONG-TERM INVESTMENT SECURITIES	0	2,025	[1]
GOODWILL	11,019	11,195	[1]
INTANGIBLE ASSETS, net	131,644	133,421	[1]
DEFERRED INCOME TAXES	23,242	38,654	[1]
OTHER ASSETS	47,516	40,419	[1]
TOTAL ASSETS	1,637,784	1,585,391	[1]
CURRENT LIABILITIES:
Accounts payable	125,355	120,469	[1]
Accrued liabilities	130,056	128,820	[1]
TOTAL CURRENT LIABILITIES	255,411	249,289	[1]
CONTINGENT EARN-OUT LIABILITY	0	47,400	[1]
OTHER LONG-TERM LIABILITIES	37,614	20,592	[1]
DEFERRED INCOME TAXES	690	721	[1]
INCOME TAX LIABILITY	3,734	3,734	[1]
COMMITMENTS AND CONTINGENCIES	0	0	[1]
STOCKHOLDERS' EQUITY:
Convertible preferred stock, $1.00 par value Authorized-500 shares; Issued and outstanding - none	0	0	[1]
Common stock, $0.10 par value - Authorized-80,000 shares; Issued 20,668 shares at March 31, 2019 and 20,492 shares at December 31, 2018 and outstanding 20,612 shares at March 31, 2019 and 20,491 shares at December 31, 2018	2,067	2,049	[1]
Additional paid-in capital	659,709	657,899	[1]
Treasury Stock, at cost	0	(95)	[1]
Retained earnings	701,141	620,747	[1]
Accumulated other comprehensive loss	(22,582)	(16,945)	[1]
TOTAL STOCKHOLDERS' EQUITY	1,340,335	1,263,655	[1]
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,637,784	1,585,391	[1]
Allowance for doubtful accounts	$ 13,439	$ 5,768
Convertible preferred stock, par value	$ 1.00	$ 1.00
Convertible preferred stock, authorized shares	500,000	500,000
Convertible preferred stock, issued shares	0	0
Convertible preferred stock, outstanding shares	0	0
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	80,000,000	80,000,000
Common stock, shares issued	20,671,000	20,492,000
Common stock, shares outstanding	20,671,000	20,491,000
Treasury Stock, Shares	(2)	(408)

[1] December 31, 2018 balances were derived from audited consolidated financial statements.