Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 176,626	$ 202,655
Current investments, amortized cost of $114,177 and $132,799 in 2024 and 2023, respectively, allowance for credit losses of $0 in 2024 and 2023	112,449	129,392
Accounts receivable, allowance for credit losses of $665 and $583 in 2024 and 2023, respectively	159,305	114,164
Unbilled revenue	1,858	2,402
Inventories	157,255	162,285
Prepaid expenses and other current assets	73,524	68,099
Total current assets	681,017	678,997
Non-current investments, amortized cost of $272,613 and $250,790 in 2024 and 2023, respectively, allowance for credit losses of $0 in 2024 and 2023	266,214	244,230
Property, plant, and equipment, net	102,997	105,849
Operating lease assets	71,283	75,115
Goodwill	381,042	393,181
Intangible assets, net	98,548	112,952
Deferred income taxes	396,723	400,400
Other assets	6,260	7,088
Total assets	2,004,084	2,017,812
Current liabilities:
Accounts payable	22,617	21,454
Accrued expenses	75,405	72,374
Accrued income taxes	20,827	16,907
Deferred revenue and customer deposits	40,529	31,525
Operating lease liabilities	9,405	9,624
Total current liabilities	168,783	151,884
Non-current operating lease liabilities	64,778	68,977
Deferred income taxes	233,798	246,877
Reserve for income taxes	28,826	26,685
Non-current accrued income taxes	0	18,338
Other liabilities	1,169	299
Total liabilities	497,354	513,060
Commitments and Contingencies
Shareholders’ equity:
Preferred stock, $.01 par value – Authorized: 400 shares in 2024 and 2023, respectively; no shares issued and outstanding	0	0
Common stock, $.002 par value – Authorized: 300,000 shares in 2024 and 2023, respectively; issued and outstanding: 171,501 and 171,599 shares in 2024 and 2023, respectively	343	343
Additional paid-in capital	1,061,597	1,037,202
Retained earnings	515,142	512,543
Accumulated other comprehensive loss, net of tax	(70,352)	(45,336)
Total shareholders’ equity	1,506,730	1,504,752
Total liabilities and shareholders' equity	$ 2,004,084	$ 2,017,812

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2