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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 10,624 $ 9,743
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization of deferred revenue (1,835) (1,837)
Depreciation 985 927
Amortization of intangibles 5,483 29
Amortization of premium and discount on investments, net (219) (437)
Stock-based employee compensation 2,935 1,951
Stock-based compensation to Board of Directors and Scientific Advisory Board 394 437
Retirement plan benefit expense 834 777
(Increase) decrease in assets:    
Accounts receivable (5,794) 1,147
Inventory 2,345 (4,728)
Other current assets (2,313) (2,257)
Other assets 2 10
(Decrease) increase in liabilities:    
Accounts payable and accrued expenses (186) 1,899
Other current liabilities 904 205
Deferred revenue 1,376 1,335
Net cash provided by operating activities 15,535 9,201
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (2,435) (2,054)
Additions to intangibles (107) (18)
Purchase of investments (185,314) (177,449)
Proceeds from sale of investments 175,093 220,552
Net cash (used in) provided by investing activities (12,763) 41,031
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from the issuance of common stock 177 137
Repurchase of common stock (5,456) 0
Proceeds from the exercise of common stock options and warrants 271 943
Payment of withholding taxes related to stock-based employee compensation (2,985) (3,508)
Net cash used in financing activities (7,993) (2,428)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (5,221) 47,804
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 85,923 111,795
CASH AND CASH EQUIVALENTS, END OF PERIOD 80,702  
The following non-cash activities occurred:    
Unrealized gain (loss) on available-for-sale securities 36 (39)
Common stock issued to Board of Directors and Scientific Advisory Board that was earned in a previous period 300 328
Common stock issued to employees that was accrued for in a previous period, net of shares withheld for taxes 282 252
Property, equipment and intangible invoices included in accounts payable $ 891 $ 0