Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 57,845	$ 57,402
Adjustments to reconcile net income to net cash provided by operating activities:
Asset impairment	228
Depreciation and amortization expense	9,791	7,915
Bad debt expense	24,379	26,168
Compensation expense related to share-based awards	4,316	7,430
Deferred income taxes	(557)	8,569
Changes in operating assets and liabilities	(41,223)	(24,739)
Net cash provided by operating activities	54,779	82,745
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of available-for-sale investments	(330,797)	(218,437)
Sales of available-for-sale investments	134,964	127,193
Purchases of property and equipment	(6,765)	(3,059)
Payments for pending business acquisition	(7,000)
Net cash used in investing activities	(209,598)	(94,303)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of common stock	849	623
Purchase of treasury stock	(15,670)	(5,372)
Payments of employee tax associated with stock compensation	(1,612)	(2,034)
Release of cash held in escrow	(3,986)
Net cash used in financing activities	(20,419)	(6,783)
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(175,238)	(18,341)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of the period	325,178	109,684
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of the period	$ 149,940	$ 91,343