Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities
Net income	$ 125,438	$ 82,366
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	70,655	57,054
Amortization of contract acquisition costs	575	332
Amortization of debt issuance costs	719	549
Imputed interest expense and fair value adjustments to contingent consideration	1,046	1,949
Provision for credit losses	(34)	563
(Gain) loss on disposal of assets	524	77
Loss on dissolution of subsidiary		19,905
Impairment losses	3,949	1,644
Deferred income taxes	514	(1,153)
Excess tax benefit from equity-based awards	(5,284)	(708)
Equity-based compensation expense	11,969	9,471
(Gain) loss on foreign currency derivatives	134	(25)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	48,816	(5,450)
Prepaids and other assets	(42,455)	14,333
Accounts payable and accrued expenses	19,406	70,441
Deferred revenue and other liabilities	(60,910)	(64,564)
Net cash provided by operating activities	175,062	186,784
Cash flows from investing activities
Proceeds from sale of long-live assets	42	16
Purchases of property, plant and equipment	(40,778)	(47,827)
Acquisitions, net of cash acquired of $18,638 and $3,123, respectively	(481,718)	(38,739)
Net cash used in investing activities	(522,454)	(86,550)
Cash flows from financing activities
Net proceeds (borrowings) from line of credit	420,000	35,000
Payments on other debt	(5,288)	(6,602)
Payments of contingent consideration and hold back payments to acquisitions	(11,517)	(48,686)
Dividends paid to shareholders	(20,132)	(15,843)
Payments to noncontrolling interest	(8,059)	(8,268)
Tax payments related to issuance of restricted stock units	(11,369)	(4,456)
Payments of debt issuance costs	(1,102)	(35)
Net cash (used in) provided by financing activities	362,533	(48,890)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(6,272)	(104)
Increase (decrease) in cash, cash equivalents and restricted cash	8,869	51,240
Cash, cash equivalents and restricted cash, beginning of period	159,015	105,591
Cash, cash equivalents and restricted cash, end of period	167,884	156,831
Supplemental disclosures
Cash paid for interest	7,827	8,436
Cash paid for income taxes	64,999	33,793
Non-cash investing and financing activities
Acquisition of long lived assets through finance leases	857	1,814
Acquisition of equipment through increase in accounts payable, net	130	(2,515)
Dividends declared but not paid	$ 22,085	$ 18,694