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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 57,273	$ 24,232
Adjustments to reconcile net income to net cash provided by operating activities:
Asset impairment	612
Depreciation and amortization expense	6,790	4,468
Bad debt expense	25,187	23,141
Compensation expense related to share-based awards	6,503	2,406
Deferred income taxes	19,262	9,213
Changes in operating assets and liabilities	(6,263)	(10,046)
Net cash provided by operating activities	109,364	53,414
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of available-for-sale investments	(209,846)	(296,666)
Sales of available-for-sale investments	145,819	265,743
Purchases of property and equipment	(3,439)	(1,408)
Business acquisition	(38,065)
Other		9
Net cash used in investing activities	(105,531)	(32,322)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of common stock	1,014	180
Purchase of treasury stock	(17,309)
Payments of employee tax associated with stock compensation	(689)	(2,562)
Net cash used in financing activities	(16,984)	(2,382)
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(13,151)	18,710
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of the period	108,687	32,731
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of the period	$ 95,536	$ 51,441

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Period Type:	duration

X

- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration