Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 55,673	$ 45,627	$ 112,061	$ 102,633
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization			35,730	19,280
Bad debt allowance			3,791	291
Deferred income taxes			(16,806)	(915)
Stock-based compensation expense			32,568	20,598
Deferred compensation plan			(17,297)	1,855
Amortization and write-off of deferred debt issuance costs			3,646	2,371
Change in fair value of derivative			(19,490)	(7,735)
Change in fair value of contingent consideration	0	0	500	0
Change on fair value of investments			(112)	0
Gain on sale of aircraft			(2,029)	0
Foreign currency remeasurement loss (gain)			5,748	(2,371)
Loss from investment accounted for using the equity method, net of tax	593	1,829	1,165	2,275
Changes in assets and liabilities, net of effect from acquisitions:
Accounts receivable			15,581	(4,665)
Prepaid and other assets			3,325	10,485
Accounts payable, accruals, and other liabilities			25,683	37,623
Deferred revenues			(20,292)	(5,746)
Income taxes payable, net of prepaid income taxes			4,958	(26,957)
Net cash provided by operating activities			168,730	149,022
Cash flows from investing activities:
Purchases of property and equipment and investment in capitalized software			(6,589)	(4,750)
Proceeds from sale of aircraft			2,380	0
Acquisitions, net of cash acquired			(714,197)	(1,002,551)
Other investing activities			(5,561)	(700)
Net cash used in investing activities			(723,967)	(1,008,001)
Cash flows from financing activities:
Proceeds from credit facilities			657,981	581,233
Payments of credit facilities			(264,107)	(790,846)
Proceeds from convertible senior notes, net of discounts and commissions			0	1,233,377
Payments of debt issuance costs			0	(4,951)
Purchase of capped call options			0	(51,555)
Repayment of term loan			(2,500)	0
Payments of financing leases			(89)	(101)
Payments of acquisition debt and other consideration			(5,059)	(544)
Payments of dividends			(17,163)	(16,591)
Proceeds from stock purchases under employee stock purchase plan			4,611	0
Proceeds from exercise of stock options			5,861	4,324
Payments for shares acquired including shares withheld for taxes			(40,520)	(87,836)
Repurchase of Class B Common Stock under approved program			(13,242)	0
Net cash provided by financing activities			325,773	866,510
Effect of exchange rate changes on cash and cash equivalents			(6,462)	1,617
(Decrease) increase in cash and cash equivalents			(235,926)	9,148
Cash and cash equivalents, beginning of year			329,337	122,006	$ 122,006
Cash and cash equivalents, end of period	$ 93,411	$ 131,154	93,411	131,154	$ 329,337
Supplemental information:
Cash paid for income taxes			11,606	25,109
Income tax refunds			1,076	5,895
Interest paid			10,528	1,871
Non-cash investing and financing activities:
Shares issued related to acquisition			0	182,390
Contingent acquisition consideration			0	4,991
Deferred, non-contingent consideration, net			0	9,593
Convertible senior notes expenses included in Accounts payable and Accruals and other current liabilities			0	692
Capped call options expenses included in Accounts payable and Accruals and other current liabilities			0	50
Share-settled Executive Bonus Plan awards			11,893	11,723
Deferred compensation plan elective participant deferrals			$ 3,108	$ 1,493