Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 130,464	$ 79,912
Adjustments to reconcile net income to net cash provided by operating activities:
Asset impairment	8,715	228
Gain on sale of asset	(22,086)
Depreciation and amortization expense	13,438	14,856
Bad debt expense	26,519	32,284
Compensation expense related to share-based awards	6,651	6,234
Deferred income taxes	4,249	1,099
Changes in operating assets and liabilities	(69,117)	(26,973)
Net cash provided by operating activities	98,833	107,640
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of available-for-sale investments	(205,529)	(410,493)
Sales of available-for-sale investments	179,139	202,927
Purchases of property and equipment	(4,801)	(9,105)
Business acquisition		(39,037)
Net cash used in investing activities	(31,191)	(255,708)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of common stock	749	916
Purchase of treasury stock	(2,729)	(23,117)
Payments of employee tax associated with stock compensation	(2,209)	(1,612)
Payments of cash dividends	(7,222)
Release of cash held in escrow	(1,000)	(3,986)
Net cash used in financing activities	(12,411)	(27,799)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	55,231	(175,867)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of the period	118,884	325,178
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of the period	$ 174,115	149,311
Supplemental non-cash disclosure:
Amounts placed in escrow during the period to secure indemnification obligations from business acquisitions		$ 1,000