Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 318,816	$ 290,072	[1]
Short-term investment securities	36,960	10,061	[1]
TOTAL CASH, CASH EQUIVALENTS AND INVESTMENT SECURITIES	355,776	300,133	[1]
Accounts receivable, net of allowance for doubtful accounts of $5,088 at September 30, 2018 and $3,311 at December 31, 2017	144,535	112,696	[1]
Inventories	291,840	288,657	[1]
Prepaid income taxes	24,447	10,594	[1]
Prepaid expenses and other current assets	26,306	41,286	[1]
Related-party receivable	70,408	98,807	[1]
Assets held-for-sale	0	12,489	[1]
TOTAL CURRENT ASSETS	913,312	864,662	[1]
PROPERTY AND EQUIPMENT, net	424,897	398,684	[1]
LONG-TERM INVESTMENT SECURITIES	2,922	14,579	[1]
GOODWILL	13,199	12,357	[1]
INTANGIBLE ASSETS, net	131,811	143,753	[1]
DEFERRED INCOME TAXES	20,341	24,775	[1]
OTHER ASSETS	38,693	38,141	[1]
TOTAL ASSETS	1,545,175	1,496,951	[1]
CURRENT LIABILITIES:
Accounts payable	70,566	78,228	[1]
Accrued liabilities	131,954	132,064	[1]
TOTAL CURRENT LIABILITIES	202,520	210,292	[1]
CONTINGENT EARN-OUT LIABILITY	47,500	27,000	[1]
OTHER LONG-TERM LIABILITIES	29,057	55,326	[1]
DEFERRED INCOME TAXES	1,193	1,487	[1]
INCOME TAX LIABILITY	4,592	4,592	[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 and outstanding 20,489 shares at September 30, 2018 and 20,210 shares at December 31, 2017	2,049	2,021	[1]
Additional paid-in capital	651,752	625,568	[1]
Treasury Stock, at cost	(128)	0	[1]
Retained earnings	628,101	585,624	[1]
Accumulated other comprehensive loss	(21,461)	(14,959)	[1]
TOTAL STOCKHOLDERS' EQUITY	1,260,313	1,198,254	[1]
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,545,175	1,496,951	[1]
Allowance for doubtful accounts	$ 5,088	$ 3,311
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	20,489,000	20,210,000
Common stock, shares outstanding	20,489,000	20,210,000
Treasury Stock, Shares	(418)	0

[1] December 31, 2017 balances were derived from audited consolidated financial statements.