Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net income	$ 107,397	$ 58,234
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	45,376	37,532
Amortization of contract acquisition costs	350	205
Amortization of debt issuance costs	447	366
Imputed interest expense and fair value adjustments to contingent consideration	1,046	1,941
Provision for credit losses	155	607
(Gain) loss on disposal of assets	386	17
Loss on dissolution of subsidiary		2,467
Impairment losses	4,217	696
Deferred income taxes	(5,522)	3,289
Excess tax benefit from equity-based awards	(3,340)	(403)
Equity-based compensation expense	7,399	5,976
(Gain) loss on foreign currency derivatives	21	114
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	48,515	(26,007)
Prepaids and other assets	3,175	30,287
Accounts payable and accrued expenses	(18,062)	35,572
Deferred revenue and other liabilities	(58,721)	(45,615)
Net cash provided by operating activities	132,839	105,278
Cash flows from investing activities
Proceeds from sale of long-live assets	29	16
Purchases of property, plant and equipment	(23,593)	(31,915)
Acquisitions, net of cash acquired of $18,638 and $3,123, respectively	(481,718)	(4,421)
Net cash used in investing activities	(505,282)	(36,320)
Cash flows from financing activities
Net proceeds (borrowings) from line of credit	449,000	410,000
Payments on other debt	(3,522)	(4,356)
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	(5,589)	(5,091)
Tax payments related to issuance of restricted stock units	(6,680)	(3,218)
Payments of debt issuance costs	(1,102)	(35)
Net cash (used in) provided by financing activities	400,458	332,771
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1,930)	(4,645)
Increase (decrease) in cash, cash equivalents and restricted cash	26,085	397,084
Cash, cash equivalents and restricted cash, beginning of period	159,015	105,591
Cash, cash equivalents and restricted cash, end of period	185,100	502,675
Supplemental disclosures
Cash paid for interest	4,637	5,924
Cash paid for income taxes	46,723	10,605
Non-cash investing and financing activities
Acquisition of long lived assets through finance leases	625	1,599
Acquisition of equipment through increase in accounts payable, net	$ (2,727)	$ (2,169)