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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 79,470,000 $ 111,876,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization of deferred revenue and recognition of unbilled receivables (112,508,000) (101,079,000)
Depreciation 11,147,000 8,958,000
Amortization of intangibles 16,474,000 16,469,000
Change in excess inventory reserve 808,000 4,155,000
Amortization of premium and discount on investments, net (4,293,000) (4,528,000)
Stock-based compensation to employees 19,807,000 10,697,000
Stock-based compensation to Board of Directors and Scientific Advisory Board 1,133,000 1,126,000
Deferred income tax expense (benefit) (2,242,000) (2,633,000)
Retirement plan expense 4,242,000 4,379,000
Decrease (increase) in assets:    
Accounts receivable (38,898,000) (22,645,000)
Inventory (20,953,000) 8,074,000
Other current assets (2,854,000) (4,602,000)
Other assets (8,721,000) (10,259,000)
Increase (decrease) in liabilities:    
Accounts payable and accrued expenses (19,633,000) (1,827,000)
Other current liabilities (806,000) 5,587,000
Deferred revenue 144,200,000 113,849,000
Other liabilities 9,454,000 149,000
Net cash provided by operating activities 75,827,000 137,746,000
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (19,213,000) (25,317,000)
Purchases of intangibles (25,000) (401,000)
Purchases of investments (604,153,000) (648,006,000)
Proceeds from sale of investments 613,310,000 590,550,000
Net cash used in investing activities (10,081,000) (83,174,000)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock 869,000 658,000
Repurchase of common stock   (649,000)
Payment of withholding taxes related to stock-based compensation to employees (14,293,000) (15,920,000)
Cash dividends paid (21,329,000) (14,142,000)
Net cash used in financing activities (34,753,000) (30,053,000)
INCREASE IN CASH AND CASH EQUIVALENTS 30,993,000 24,519,000
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 131,627,000 211,022,000
CASH AND CASH EQUIVALENTS, END OF PERIOD $ 162,620,000 $ 235,541,000