Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 56,388	$ 57,006
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,212	8,993
Bad debt allowance	955	746
Deferred income taxes	9,042	966
Stock-based compensation expense	15,099	8,913
Deferred compensation plan	(5,138)	1,021
Amortization and write-off of deferred debt issuance costs	1,778	1,229
Change in fair value of derivative	(12,084)	(13,661)
Change in fair value of contingent consideration	500	0
Change on fair value of investments	(112)	0
Gain on sale of aircraft	(2,029)	0
Foreign currency remeasurement loss (gain)	1,677	(583)
Loss from investment accounted for using the equity method, net of tax	572	446
Changes in assets and liabilities, net of effect from acquisitions:
Accounts receivable	8,691	14,903
Prepaid and other assets	5,718	8,257
Accounts payable, accruals, and other liabilities	26,791	54,977
Deferred revenues	(12,515)	(21,889)
Income taxes payable, net of prepaid income taxes	(10,814)	11,474
Net cash provided by operating activities	101,731	132,798
Cash flows from investing activities:
Purchases of property and equipment and investment in capitalized software	(4,176)	(2,655)
Proceeds from sale of aircraft	2,380	0
Acquisitions, net of cash acquired	(695,968)	(57,975)
Other investing activities	(2,811)	0
Net cash used in investing activities	(700,575)	(60,630)
Cash flows from financing activities:
Proceeds from credit facilities	563,912	16,000
Payments of credit facilities	(123,696)	(262,000)
Proceeds from convertible senior notes, net of discounts and commissions	0	672,750
Payments of debt issuance costs	0	(3,777)
Purchase of capped call options	0	(25,530)
Repayment of term loan	(1,250)	0
Payments of financing leases	(48)	(50)
Payments of acquisition debt and other consideration	(2,721)	(25)
Payments of dividends	(8,528)	(8,219)
Payments for shares acquired including shares withheld for taxes	(35,117)	(18,763)
Proceeds from stock purchases under employee stock purchase plan	4,611	0
Proceeds from exercise of stock options	2,768	1,751
Net cash provided by financing activities	399,931	372,137
Effect of exchange rate changes on cash and cash equivalents	(807)	3,225
(Decrease) increase in cash and cash equivalents	(199,720)	447,530
Cash and cash equivalents, beginning of year	329,337	122,006	$ 122,006
Cash and cash equivalents, end of period	129,617	569,536	$ 329,337
Supplemental information:
Cash paid for income taxes	6,766	4,214
Income tax refunds	798	4,519
Interest paid	5,296	766
Non-cash investing and financing activities:
Contingent acquisition consideration	0	549
Deferred, non-contingent consideration, net	0	1,718
Convertible senior notes expenses included in Accounts payable and Accruals and other current liabilities	0	605
Capped call options expenses included in Accounts payable	0	150
Share-settled Executive Bonus Plan awards	4,996	5,574
Deferred compensation plan elective participant deferrals	$ 669	$ 855