Consolidated Balance Sheets - USD ($)	Dec. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 344,781,000	$ 290,072,000
Short-term investment securities	37,329,000	10,061,000
TOTAL CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENT SECURITIES	382,110,000	300,133,000
Accounts receivable, net of allowance for doubtful accounts of $5,768 at December 31, 2018 and $3,311 at December 31, 2017	176,298,000	112,696,000
Inventories	311,163,000	288,657,000
Prepaid income taxes	11,348,000	10,594,000
Prepaid expenses and other current assets	25,980,000	41,286,000
Related-party receivable	20,137,000	98,807,000
Assets Held-for-sale	0	12,489,000
Total current assets	927,036,000	864,662,000
PROPERTY AND EQUIPMENT, net	432,641,000	398,684,000
LONG-TERM INVESTMENT SECURITIES	2,025,000	14,579,000
GOODWILL	11,195,000	12,357,000
INTANGIBLE ASSETS, net	133,421,000	143,753,000
DEFERRED INCOME TAXES	38,654,000	24,775,000
Other Assets	40,419,000	38,141,000
TOTAL ASSETS	1,585,391,000	1,496,951,000
CURRENT LIABILITIES:
Accounts payable	120,469,000	78,228,000
Accrued liabilities	128,820,000	132,064,000
Total current liabilities	249,289,000	210,292,000
Contingent Earn-out Liability	47,400,000	27,000,000
OTHER LONG-TERM LIABILITIES	20,592,000	55,326,000
DEFERRED INCOME TAXES	721,000	1,487,000
INCOME TAX LIABILITY	3,734,000	4,592,000
COMMITMENTS AND CONTINGENCIES	0	0
STOCKHOLDERS' EQUITY:
Convertible preferred stock, $1.00 par value Authorized-500 shares; Issued and outstanding - none	0	0
Common stock, $0.10 par value - Authorized-80,000 shares; Issued 20,492 shares at December 31, 2018 and 20,210 at December 31, 2017 and outstanding 20,491 shares at December 31, 2018 and 20,210 shares at December 31, 2017	2,049,000	2,021,000
Additional paid-in capital	657,899,000	625,568,000
Treasury Stock, Value	(95,000)	0
Retained earnings	620,747,000	585,624,000
Accumulated other comprehensive loss	(16,945,000)	(14,959,000)
Total stockholders' equity	1,263,655,000	1,198,254,000
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,585,391,000	1,496,951,000
Allowance for doubtful accounts	$ 5,768,045	$ 3,311,312
Convertible preferred stock, par value	$ 1	$ 1
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	$ 0.1	$ 0.1
Common stock, shares authorized	80,000,000	80,000,000
Common stock, shares issued	20,491,637	20,210,054
Common stock, shares outstanding	20,491,229	20,210,054
Treasury Stock, Common, Shares	408	0