CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 69,153	$ 139,365
Short-term investments	296,282	188,644
Accounts receivable	43,256	24,994
Inventory	32,733	17,314
Deferred income taxes		8,661
Other current assets	9,227	6,392
Total current assets	450,651	385,370
PROPERTY AND EQUIPMENT, net of accumulated depreciation of $35,087 and $32,167	49,358	27,203
ACQUIRED TECHNOLOGY, net of accumulated amortization of $86,162 and $70,714	136,679	152,127
OTHER INTANGIBLE ASSETS, net of accumulated amortization of $1,652 and $615	15,188	16,225
GOODWILL	15,535	15,535
INVESTMENTS	14,794	14,960
DEFERRED INCOME TAXES	44,618	15,832
OTHER ASSETS	347	307
TOTAL ASSETS	727,170	627,559
CURRENT LIABILITIES:
Accounts payable	13,780	8,112
Accrued expenses	20,694	19,845
Deferred revenue	10,603	10,282
Other current liabilities	1,199	1,967
Total current liabilities	46,276	40,206
DEFERRED REVENUE	25,658	31,322
RETIREMENT PLAN BENEFIT LIABILITY	32,226	27,563
Total liabilities	104,160	99,091
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, 48,466,087 and 48,270,990 shares issued, and 47,108,224 and 46,913,127 shares outstanding, at September 30, 2017 and December 31, 2016, respectively	485	483
Additional paid-in capital	606,415	604,364
Retained earnings (accumulated deficit)	67,725	(25,557)
Accumulated other comprehensive loss	(11,459)	(10,666)
Treasury stock, at cost (1,357,863 shares at September 30, 2017 and December 31, 2016)	(40,158)	(40,158)
Total shareholders’ equity	623,010	528,468
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 727,170	$ 627,559