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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 92,228,000 $ 38,970,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization of deferred revenue and recognition of unbilled receivables (110,993,000) (58,644,000)
Depreciation 9,229,000 7,283,000
Amortization of intangibles 10,985,000 10,980,000
Change in excess inventory reserve 1,117,000 611,000
Amortization of premium and discount on investments, net (128,000) (3,280,000)
Stock-based compensation to employees 14,624,000 12,918,000
Stock-based compensation to Board of Directors and Scientific Advisory Board 704,000 708,000
Deferred income tax expense (benefit) 1,458,000 (336,000)
Retirement plan expense 4,457,000 2,828,000
Decrease (increase) in assets:    
Accounts receivable (17,368,000) (8,046,000)
Inventory (14,179,000) (21,181,000)
Other current assets (5,712,000) (5,967,000)
Other assets (15,005,000) (5,942,000)
Increase (decrease) in liabilities:    
Accounts payable and accrued expenses (17,036,000) (20,332,000)
Other current liabilities (2,536,000) (639,000)
Deferred revenue 92,816,000 75,683,000
Other liabilities 14,455,000 6,416,000
Net cash provided by operating activities 59,116,000 32,030,000
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (20,668,000) (11,804,000)
Purchases of intangibles (394,000) (25,000)
Purchases of investments (193,951,000) (404,232,000)
Proceeds from sale and maturity of investments 100,000,000 412,760,000
Net cash used in investing activities (115,013,000) (3,301,000)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock 787,000 590,000
Payment of withholding taxes related to stock-based compensation to employees (13,018,000) (13,165,000)
Cash dividends paid (18,970,000) (14,215,000)
Net cash used in financing activities (31,201,000) (26,790,000)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (87,098,000) 1,939,000
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 630,012,000 131,627,000
CASH AND CASH EQUIVALENTS, END OF PERIOD $ 542,914,000 $ 133,566,000