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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 138,304	$ 58,840	$ 103,885
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred revenue and recognition of unbilled receivables	(135,368)	(68,905)	(11,122)
Depreciation	12,456	8,612	4,919
Amortization of intangibles	21,962	21,962	21,983
Change in excess inventory reserve	5,938	3,630	0
Amortization of premium and discount on investments, net	(6,643)	(6,131)	(2,871)
Stock-based compensation to employees	16,148	12,432	12,284
Stock-based compensation to Board of Directors and Scientific Advisory Board	1,548	4,364	2,609
Change in earnout liability recorded for Adesis acquisition			519
Deferred income tax (benefit) expense	(5,776)	(12,814)	24,396
Retirement plan expense	5,818	4,466	4,351
Decrease (increase) in assets:
Accounts receivable	(17,323)	9,226	(27,361)
Inventory	109	(37,365)	(18,951)
Other current assets	(15,238)	4,860	(3,884)
Deferred income taxes		20,682
Other assets	(13,291)	(63,922)	(297)
Increase (decrease) in liabilities:
Accounts payable and accrued expenses	15,516	1,563	16,420
Other current liabilities	(5,183)	5,761	(1,917)
Deferred revenue	157,321	130,639	8,402
Other liabilities	17,614	23,896
Net cash provided by operating activities	193,912	121,796	133,365
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(30,059)	(25,391)	(29,803)
Purchase of intangibles	(401)
Purchases of investments	(931,854)	(628,789)	(594,283)
Proceeds from sale of investments	723,600	633,179	498,508
Net cash used in investing activities	(238,714)	(21,001)	(125,578)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	889	798	734
Repurchase of common stock	(649)	(477)
Proceeds from the exercise of common stock options			38
Payment of withholding taxes related to stock-based compensation to employees	(15,980)	(11,620)	(9,432)
Cash dividends paid	(18,853)	(11,314)	(5,652)
Net cash used in financing activities	(34,593)	(22,613)	(14,312)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(79,395)	78,182	(6,525)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	211,022	132,840	139,365
CASH AND CASH EQUIVALENTS, END OF YEAR	$ 131,627	$ 211,022	$ 132,840

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