Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 291,867	$ 344,781	[1]
Short-term investment securities	21,863	37,329	[1]
TOTAL CASH, CASH EQUIVALENTS AND INVESTMENT SECURITIES	313,730	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	230,294	176,298	[1]
Inventories	329,955	311,163	[1]
Prepaid income taxes	20,915	11,348	[1]
Prepaid expenses and other current assets	34,722	46,117	[1]
TOTAL CURRENT ASSETS	929,616	927,036	[1]
PROPERTY AND EQUIPMENT, net	436,920	432,641	[1]
Operating Lease, Right-of-Use Asset	36,787	0	[1]
LONG-TERM INVESTMENT SECURITIES	2,017	2,025	[1]
GOODWILL	11,181	11,195	[1]
INTANGIBLE ASSETS, net	134,054	133,421	[1]
DEFERRED INCOME TAXES	28,145	38,654	[1]
OTHER ASSETS	44,197	40,419	[1]
TOTAL ASSETS	1,622,917	1,585,391	[1]
CURRENT LIABILITIES:
Accounts payable	131,190	120,469	[1]
Accrued liabilities	128,772	128,820	[1]
TOTAL CURRENT LIABILITIES	259,962	249,289	[1]
CONTINGENT EARN-OUT LIABILITY	200	47,400	[1]
OTHER LONG-TERM LIABILITIES	40,439	20,592	[1]
DEFERRED INCOME TAXES	718	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	657,543	657,899	[1]
Treasury Stock, at cost	(1,650)	(95)	[1]
Retained earnings	674,578	620,747	[1]
Accumulated other comprehensive loss	(14,674)	(16,945)	[1]
TOTAL STOCKHOLDERS' EQUITY	1,317,864	1,263,655	[1]
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,622,917	1,585,391	[1]
Allowance for doubtful accounts	$ 11,646	$ 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	20,668,000	20,492,000
Common stock, shares outstanding	20,661,000	20,491,000
Treasury Stock, Shares	(7,035)	(408)

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