CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 54,416	$ 97,513
Short-term investments	231,452	297,981
Accounts receivable	22,476	24,729
Inventory	16,103	12,748
Deferred income taxes	10,084	12,326
Other current assets	7,499	2,387
Total current assets	342,030	447,684
PROPERTY AND EQUIPMENT, net of accumulated depreciation of $30,899 and $27,897	25,768	22,407
ACQUIRED TECHNOLOGY, net of accumulated amortization of $65,565 and $54,837	157,276	72,015
OTHER INTANGIBLE ASSETS, net of accumulated amortization of $311 and none	16,139
GOODWILL	15,548
INVESTMENTS	15,217	2,187
DEFERRED INCOME TAXES	12,352	14,945
OTHER ASSETS	423	174
TOTAL ASSETS	584,753	559,412
CURRENT LIABILITIES:
Accounts payable	5,544	6,849
Accrued expenses	13,190	17,387
Deferred revenue	10,211	10,107
Other current liabilities	1,672	167
Total current liabilities	30,617	34,510
DEFERRED REVENUE	33,454	35,543
RETIREMENT PLAN BENEFIT LIABILITY	24,865	22,594
Total liabilities	88,936	92,647
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, 48,314,591 and 48,132,223 shares issued, and 46,956,728 and 46,774,360 shares outstanding at September 30, 2016 and December 31, 2015, respectively	483	482
Additional paid-in capital	596,453	589,885
Accumulated deficit	(51,376)	(73,627)
Accumulated other comprehensive loss	(9,587)	(9,819)
Treasury stock, at cost (1,357,863 shares at September 30, 2016 and December 31, 2015)	(40,158)	(40,158)
Total shareholders’ equity	495,817	466,765
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 584,753	$ 559,412