Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating activities:
Net income	$ 147,138	$ 165,589
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	162,603	158,119
Stock-based compensation expense	56,308	57,893
Deferred taxes	(6,548)	(50,790)
Loss from divested operations	0	2,075
Loss on extinguishment of debt	44,814	0
Fair value adjustment - equity security	0	(9,120)
Reduction in the carrying amount of operating lease right-of-use assets	62,876	63,692
Amortization and write-off of deferred financing fees	7,487	4,865
Amortization of deferred swap losses from de-designation	10,320	0
Loss on de-designated swaps	476	0
Changes in assets and liabilities:
Fees receivable, net	369,119	215,132
Deferred commissions	56,094	35,329
Prepaid expenses and other current assets	(9,104)	(941)
Other assets	(3,509)	(46,954)
Deferred revenues	(210,170)	70,006
Accounts payable and accrued and other liabilities	(45,074)	(182,294)
Cash provided by operating activities	642,830	482,601
Investing activities:
Additions to property, equipment and leasehold improvements	(60,845)	(95,701)
Acquisitions - cash paid (net of cash acquired)	0	(2,295)
Cash used in investing activities	(60,845)	(97,996)
Financing activities:
Proceeds from employee stock purchase plan	13,813	13,235
Proceeds from borrowings	2,000,000	5,000
Early redemption premium payment	(30,752)	0
Payments of deferred financing fees	(23,627)	0
Proceeds from revolving credit facility	327,000	281,000
Payments on revolving credit facility	(475,000)	(316,000)
Payments on borrowings	(2,053,342)	(74,612)
Purchases of treasury stock	(76,117)	(141,436)
Cash used in financing activities	(318,025)	(232,813)
Net increase in cash and cash equivalents	263,960	151,792
Effects of exchange rates on cash and cash equivalents	8,919	(3,728)
Cash and cash equivalents and restricted cash, beginning of period	280,836	158,663
Cash and cash equivalents, end of period	$ 553,715	$ 306,727