Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net income	$ 58,816	$ 58,316
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	12,876	11,491
Gain on sale of operations, net	(6,385)	(152)
Bad debt expense, net of recoveries	265	3,234
Adjustment to contingent earnout liability	753	(155)
Stock-based compensation expense	5,454	4,280
Excess tax benefits from share based payment arrangements	(3,368)	(1,427)
Deferred income taxes	5,360	1,129
Other, net	(478)	138
Changes in assets and liabilities, net of acquisitions and divestitures:
Accounts receivable, net	(69,363)	(47,545)
Other assets	(11,279)	894
Accounts payable	36,574	17,810
Income taxes payable	2,599	19,365
Accrued personnel costs	(7,634)	(19,824)
Other liabilities	42,117	8,014
Operating cash flows provided by continuing operations	66,307	55,568
Operating cash flows used in discontinued operations	(13)	(45)
Net cash provided by operating activities	66,294	55,523
Cash flows from investing activities:
Business acquisitions and purchases of client lists, net of cash acquired	(43,172)	(7,888)
Purchases of client fund investments	(7,900)	(3,447)
Proceeds from the sales and maturities of client fund investments	7,965	25,316
Proceeds from sales of divested operations	9,785	651
Change in funds held for clients	(4,029)	3,125
Additions to property and equipment	(3,258)	(5,306)
Other	472	356
Net cash (used in) provided by investing activities	(40,137)	12,807
Cash flows from financing activities:
Proceeds from bank debt	431,700	440,254
Payment of bank debt	(376,400)	(425,754)
Payment for acquisition of treasury stock	(64,506)	(29,029)
Indirect repurchase of shares for minimum tax withholding	(3,037)	(2,040)
Decrease in client funds obligations	(27,823)	(50,793)
Proceeds from exercise of stock options	5,448	3,227
Payment of contingent consideration for acquisitions	(7,850)	(6,199)
Other, net	(114)	(226)
Net cash used in financing activities	(42,582)	(70,560)
Net decrease in cash, cash equivalents and restricted cash	(16,425)	(2,230)
Cash, cash equivalents and restricted cash at beginning of year	170,335	146,505
Cash, cash equivalents and restricted cash at end of period	153,910	144,275
Reconciliation of cash, cash equivalents and restricted cash to the    Consolidated Balance Sheets:
Cash and cash equivalents	4,677	9,620
Restricted cash	39,268	42,411
Cash equivalents included in funds held for clients	109,965	92,244
Total cash, cash equivalents and restricted cash	$ 153,910	$ 144,275