Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 34,484	$ 32,078
Adjustments to reconcile net income to net cash provided by operating activities:
Asset impairment	570
Depreciation and amortization expense	5,155	4,882
Bad debt expense	10,757	13,715
Compensation expense related to share-based awards	2,294	2,416
Deferred income taxes	304	986
Changes in operating assets and liabilities	(48,992)	(31,923)
Net cash provided by operating activities	4,572	22,154
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of available-for-sale investments	(83,777)	(194,997)
Sales of available-for-sale investments	64,344	59,825
Purchases of property and equipment	(1,925)	(4,742)
Business acquisition		(7,000)
Net cash used in investing activities	(21,358)	(146,914)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of common stock	247	659
Purchase of treasury stock	(815)	(3,828)
Payments of employee tax associated with stock compensation	(2,209)	(1,610)
Release of cash held in escrow		(3,986)
Net cash used in financing activities	(2,777)	(8,765)
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(19,563)	(133,525)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of the period	118,884	325,178
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of the period	$ 99,321	$ 191,653