Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities:
Net income	$ 130,174	$ 124,201
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	108,632	105,721
Stock-based compensation expense	40,807	44,939
Deferred taxes	(1,813)	(49,414)
Loss from divested operations	0	2,075
Reduction in the carrying amount of operating lease right-of-use assets	43,256	42,556
Amortization and write-off of deferred financing fees	5,392	3,238
Amortization of deferred swap losses from de-designation	10,320	0
Changes in assets and liabilities:
Fees receivable, net	261,124	140,841
Deferred commissions	31,255	22,974
Prepaid expenses and other current assets	14,202	16,734
Other assets	(932)	(49,524)
Deferred revenues	(149,615)	47,923
Accounts payable and accrued and other liabilities	(93,885)	(189,186)
Cash provided by operating activities	398,917	263,078
Investing activities:
Additions to property, equipment and leasehold improvements	(45,865)	(59,479)
Acquisitions - cash paid (net of cash acquired)	0	(2,295)
Cash used in investing activities	(45,865)	(61,774)
Financing activities:
Proceeds from employee stock purchase plan	9,719	9,077
Proceeds from borrowings	800,000	5,000
Payments of deferred financing fees	(10,516)	0
Proceeds from revolving credit facility	327,000	253,000
Payments on revolving credit facility	(475,000)	(316,000)
Payments on borrowings	(853,094)	(46,647)
Purchases of treasury stock	(73,862)	(46,558)
Cash used in financing activities	(275,753)	(142,128)
Net increase in cash and cash equivalents	77,299	59,176
Effects of exchange rates on cash and cash equivalents	(1,502)	614
Cash and cash equivalents and restricted cash, beginning of period	280,836	158,663
Cash and cash equivalents, end of period	$ 356,633	$ 218,453