Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 296,044	$ 344,781	[1]
Short-term investment securities	17,214	37,329	[1]
TOTAL CASH, CASH EQUIVALENTS AND INVESTMENT SECURITIES	313,258	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	238,069	176,298	[1]
Inventories	321,747	311,163	[1]
Prepaid income taxes	17,523	11,348	[1]
Prepaid expenses and other current assets	29,910	46,117	[1]
TOTAL CURRENT ASSETS	920,507	927,036	[1]
PROPERTY AND EQUIPMENT, net	432,938	432,641	[1]
Operating Lease, Right-of-Use Asset	38,365	0	[1]
LONG-TERM INVESTMENT SECURITIES	2,021	2,025	[1]
GOODWILL	11,241	11,195	[1]
INTANGIBLE ASSETS, net	131,053	133,421	[1]
DEFERRED INCOME TAXES	33,396	38,654	[1]
OTHER ASSETS	43,750	40,419	[1]
TOTAL ASSETS	1,613,271	1,585,391	[1]
CURRENT LIABILITIES:
Accounts payable	133,542	120,469	[1]
Accrued liabilities	104,865	128,820	[1]
TOTAL CURRENT LIABILITIES	238,407	249,289	[1]
CONTINGENT EARN-OUT LIABILITY	39,700	47,400	[1]
OTHER LONG-TERM LIABILITIES	48,010	20,592	[1]
DEFERRED INCOME TAXES	726	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	659,819	657,899	[1]
Treasury Stock, at cost	(13,056)	(95)	[1]
Retained earnings	651,745	620,747	[1]
Accumulated other comprehensive loss	(17,881)	(16,945)	[1]
TOTAL STOCKHOLDERS' EQUITY	1,282,694	1,263,655	[1]
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,613,271	1,585,391	[1]
Allowance for doubtful accounts	$ 7,852	$ 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	20,612,000	20,491,000
Treasury Stock, Shares	(56,379)	(408)

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