Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Net income	$ 75,097	$ 20,795
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	54,696	53,458
Stock-based compensation expense	25,129	31,819
Deferred taxes	25,537	(25,530)
Loss from divested operations	0	2,075
Reduction in the carrying amount of operating lease right-of-use assets	22,862	20,939
Amortization and write-off of deferred financing fees	1,637	1,616
Changes in assets and liabilities:
Fees receivable, net	135,661	78,390
Deferred commissions	17,520	4,073
Prepaid expenses and other current assets	(12,656)	8,891
Other assets	5,961	(28,517)
Deferred revenues	(26,228)	85,740
Accounts payable and accrued and other liabilities	(269,467)	(218,153)
Cash provided by operating activities	55,749	35,596
Investing activities:
Additions to property, equipment and leasehold improvements	(24,536)	(20,060)
Acquisitions - cash paid (net of cash acquired)	0	(2,295)
Cash used in investing activities	(24,536)	(22,355)
Financing activities:
Proceeds from employee stock purchase plan	5,641	5,083
Proceeds from borrowings	0	35,000
Payments on borrowings	(967)	(18,682)
Purchases of treasury stock	(73,164)	(44,839)
Cash used in financing activities	(68,490)	(23,438)
Net decrease in cash and cash equivalents	(37,277)	(10,197)
Effects of exchange rates on cash and cash equivalents	(15,709)	804
Cash and cash equivalents, beginning of period	280,836	158,663
Cash and cash equivalents, end of period	$ 227,850	$ 149,270