Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Cash flows from operating activities:
Net income (loss)	$ 43,966	$ 55,488
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation and amortization	14,066	12,005
Non-cash lease expense	2,855	3,043
Lease-related impairment charges	738	2,293
Share-based compensation	25,757	25,284
Amortization of debt discount and issuance costs	571	508
Allowances for doubtful accounts	396	2,353
Gain on sale of property and equipment	0	101
Change in fair value of contingent consideration liabilities	(71)	(416)
Deferred income taxes	399	1,942
Change in fair value of equity investment	5,014	0
Debt Securities, Available-for-Sale, Allowance for Credit Loss	11,125	0
Changes in operating assets and liabilities, net of acquisitions:
(Increase) decrease in receivables from clients, net	5,494	(20,372)
(Increase) decrease in unbilled services, net	(26,945)	3,057
(Increase) decrease in current income tax receivable / payable, net	(17,161)	(2,606)
(Increase) decrease in other assets	(6,051)	(14,942)
Increase (decrease) in accounts payable and other liabilities	4,063	(6,978)
Increase (decrease) in accrued payroll and related benefits	(91,280)	(86,400)
Increase (decrease) in deferred revenues	284	2,339
Net cash used in operating activities	(26,780)	(23,503)
Cash flows from investing activities:
Purchases of property and equipment	(3,892)	(3,665)
Investments in life insurance policies	(2,312)	(1,361)
Purchases of businesses, net of cash acquired	(53,111)	(20,769)
Capitalization of internally developed software costs	(10,919)	(14,138)
Proceeds from note receivable	154	154
Proceeds from sale of property and equipment	0	102
Net cash used in investing activities	(70,080)	(39,677)
Cash flows from financing activities:
Proceeds from exercises of stock options	2,591	1,215
Shares redeemed for employee tax withholdings	(32,507)	(21,080)
Share repurchases	(134,369)	(97,264)
Proceeds from bank borrowings	552,000	618,500
Repayments of bank borrowings	(251,875)	(430,938)
Payments for debt issuance costs	0	(1,446)
Deferred payments for business acquisitions	(36)	(261)
Net cash provided by financing activities	135,804	68,726
Effect of exchange rate changes on cash	156	(49)
Net increase in cash and cash equivalents	39,100	5,497
Cash and cash equivalents at beginning of the period	21,911	12,149
Cash and cash equivalents at end of the period	61,011	17,646
Non-cash investing and financing activities:
Property and equipment expenditures and capitalized software included in current liabilities	3,054	4,827
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	1,435	3,214
Common stock issued related to purchases of businesses	20,897	8,640
Contingent consideration accrued related to purchases of businesses	15,400	36
Excise tax on net share repurchases included in current liabilities	$ 664	$ 449