CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
CURRENT ASSETS:
Cash and cash equivalents	$ 97,513	$ 45,418
Short-term investments	297,981	243,088
Accounts receivable	24,729	22,075
Inventory	12,748	37,109
Deferred income taxes	12,326	18,459
Other current assets	2,387	4,356
Total current assets	447,684	370,505
PROPERTY AND EQUIPMENT, net of accumulated depreciation of $27,897 and $24,813	22,407	19,922
ACQUIRED TECHNOLOGY, net of accumulated amortization of $54,837 and $43,838	72,015	83,014
INVESTMENTS	2,187	3,047
DEFERRED INCOME TAXES	14,945	12,934
OTHER ASSETS	174	425
TOTAL ASSETS	559,412	489,847
CURRENT LIABILITIES:
Accounts payable	6,849	9,260
Accrued expenses	17,387	14,986
Deferred revenue	10,107	2,466
Other current liabilities	167	111
Total current liabilities	34,510	26,823
DEFERRED REVENUE	35,543	3,366
RETIREMENT PLAN BENEFIT LIABILITY	22,594	10,916
Total liabilities	$ 92,647	$ 41,105
COMMITMENTS AND CONTINGENCIES (Note 14)
SHAREHOLDERS' EQUITY:
Preferred Stock, par value $0.01 per share, 5,000,000 shares authorized, 200,000 shares of Series A Nonconvertible Preferred Stock issued and outstanding (liquidation value of $7.50 per share or $1,500)	$ 2	$ 2
Common Stock, par value $0.01 per share, 100,000,000 shares authorized, 48,132,223 and 47,061,826 shares issued at December 31, 2015 and 2014, respectively	482	471
Additional paid-in capital	589,885	581,114
Accumulated deficit	(73,627)	(88,305)
Accumulated other comprehensive loss	(9,819)	(4,382)
Treasury stock, at cost (1,357,863 shares at December 31, 2015 and 2014)	(40,158)	(40,158)
Total shareholders’ equity	466,765	448,742
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 559,412	$ 489,847