Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net income	$ 45,490	$ 56,388
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18,057	17,212
Deferred income taxes	(4,178)	9,042
Stock-based compensation expense	19,484	15,099
Deferred compensation plan	4,146	(5,138)
Amortization of deferred debt issuance costs	1,823	1,778
Change in fair value of derivative	4,489	(12,084)
Foreign currency remeasurement (gain) loss	1,018	1,677
Other non-cash items, net	(4,411)	(114)
Changes in assets and liabilities, net of effect from acquisitions:
Accounts receivable	15,420	8,691
Prepaid and other assets	12,137	5,718
Accounts payable, accruals, and other liabilities	53,127	26,791
Deferred revenues	1,942	(12,515)
Income taxes payable, net of prepaid income taxes	7,679	(10,814)
Net cash provided by operating activities	176,223	101,731
Cash flows from investing activities:
Purchases of property and equipment and investment in capitalized software	(4,284)	(4,176)
Proceeds from sale of aircraft	0	2,380
Acquisitions, net of cash acquired	(10,299)	(695,968)
Purchases of investments	(6,178)	(2,811)
Net cash used in investing activities	(20,761)	(700,575)
Cash flows from financing activities:
Proceeds from credit facilities	117,139	563,912
Payments of credit facilities	(223,124)	(123,696)
Repayments from term loan	(1,250)	(1,250)
Payments of contingent and non-contingent consideration	(249)	(2,721)
Payments of dividends	(14,522)	(8,528)
Proceeds from stock purchases under employee stock purchase plan	4,557	4,611
Proceeds from exercise of stock options	4,202	2,768
Payments for shares acquired including shares withheld for taxes	(20,948)	(35,117)
Other financing activities	(46)	(48)
Net cash provided by financing activities	(134,241)	399,931
Effect of exchange rate changes on cash and cash equivalents	662	(807)
Increase (decrease) in cash and cash equivalents	21,883	(199,720)
Cash and cash equivalents, beginning of year	71,684	329,337
Cash and cash equivalents, end of period	93,567	129,617
Supplemental information:
Cash paid for income taxes	6,104	6,766
Income tax refunds	71	798
Interest paid	10,473	5,296
Non-cash investing and financing activities:
Cost method investment	3,500	0
Deferred, non-contingent consideration, net	525	0
Share-settled executive bonus plan awards	5,484	4,996
Deferred compensation plan elective participant deferrals	$ 1,533	$ 669