CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
CURRENT ASSETS:
Cash and cash equivalents	$ 45,418	$ 70,586
Short-term investments	243,088	202,024
Accounts receivable	22,075	15,657
Inventory	37,109	10,595
Deferred income taxes	18,459	21,563
Other current assets	4,356	6,623
Total current assets	370,505	327,048
PROPERTY AND EQUIPMENT, net of accumulated depreciation of $24,813 and $22,756	19,922	14,893
ACQUIRED TECHNOLOGY, net of accumulated amortization of $43,838 and $32,841	83,014	94,011
INVESTMENTS	3,047	7,417
DEFERRED INCOME TAXES	12,934	19,143
OTHER ASSETS	425	242
TOTAL ASSETS	489,847	462,754
CURRENT LIABILITIES:
Accounts payable	9,260	5,256
Accrued expenses	14,986	16,039
Deferred revenue	2,466	1,910
Other current liabilities	111	24
Total current liabilities	26,823	23,229
DEFERRED REVENUE	3,366	2,403
RETIREMENT PLAN BENEFIT LIABILITY	10,916	9,436
Total liabilities	41,105	35,068
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, 47,061,826 and 46,825,168 shares issued at December 31, 2014 and 2013, respectively	471	468
Additional paid-in capital	581,114	572,401
Accumulated deficit	(88,305)	(130,159)
Accumulated other comprehensive loss	(4,382)	(4,368)
Treasury stock, at cost (1,357,863 and 401,501 shares at December 31, 2014 and 2013, respectively)	(40,158)	(10,658)
Total shareholders’ equity	448,742	427,686
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 489,847	$ 462,754