Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net income	$ 55,024	$ 24,685
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,459	18,872
Amortization of contract acquisition costs	176	130
Amortization of debt issuance costs	175	183
Imputed interest expense and fair value adjustments to contingent consideration	877	3,220
Provision for credit losses	21	162
(Gain) loss on disposal of assets	46	14
Impairment losses	3,517	696
Deferred income taxes	(1,090)	4,589
Excess tax benefit from equity-based awards	(1,775)	(195)
Equity-based compensation expense	4,028	2,919
(Gain) loss on foreign currency derivatives	61	485
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	27,053	11,611
Prepaids and other assets	(22,669)	19,219
Accounts payable and accrued expenses	15,972	(933)
Deferred revenue and other liabilities	(32,088)	(23,492)
Net cash provided by operating activities	69,787	62,165
Cash flows from investing activities
Proceeds from sale of long-live assets	25	15
Purchases of property, plant and equipment	(11,565)	(16,813)
Acquisitions, net of cash acquired of zero and $3,123, respectively	(267)	(5,243)
Net cash used in investing activities	(11,807)	(22,041)
Cash flows from financing activities
Net proceeds (borrowings) from line of credit	(46,000)	410,000
Payments on other debt	(1,871)	(2,400)
Payments to noncontrolling interest	(2,385)	(2,091)
Tax payments related to issuance of restricted stock units	(3,927)	(1,810)
Payments of debt issuance costs		(35)
Net cash (used in) provided by financing activities	(54,183)	403,664
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(2,576)	(7,374)
Increase (decrease) in cash, cash equivalents and restricted cash	1,221	436,414
Cash, cash equivalents and restricted cash, beginning of period	159,015	105,591
Cash, cash equivalents and restricted cash, end of period	160,236	542,005
Supplemental disclosures
Cash paid for interest	1,576	2,864
Cash paid for income taxes	4,275	3,248
Non-cash investing and financing activities
Acquisition of long lived assets through finance leases	137	837
Acquisition of equipment through increase in accounts payable, net	(3,431)	(3,511)
Dividends declared but not paid	$ 20,132	$ 15,843