Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net income/(loss)	$ 92,824	$ (3,885)
Less: Income/(loss) from discontinued operations, net of tax	13	(94)
Net income/(loss) from continuing operations	92,811	(3,791)
Adjustments to reconcile net income from continuing operations to net cash provided by operating activities:
Depreciation and amortization	93,544	96,325
Amortization of debt issuance costs	2,493	2,583
Amortization of operating lease assets	7,284	7,923
Impairment loss	1,228	47,834
Provision for bad debt and claim losses	7,893	7,577
Share-based compensation	21,838	17,755
Equity in (earnings)/losses of affiliates, net of taxes	(888)	108
Loss on early extinguishment of debt	0	1,453
Deferred income tax	3,087	(8,291)
(Gain)/loss on investments and other, net	(4,089)	2,150
Tax indemnification release	0	13,394
Accounts receivable	(9,545)	(38,845)
Prepaid expenses and other current assets	(4,767)	(6,189)
Accounts payable and other accrued expenses	4,889	(24,962)
Contract liabilities	66,786	12,329
Income taxes	(7,893)	15,890
Dividends received from investments in affiliates	109	0
Other assets and other liabilities	(31,660)	(22,649)
Net cash provided by operating activities - continuing operations	243,120	120,594
Net cash provided by operating activities - discontinued operations	18	0
Total cash provided by operating activities	243,138	120,594
Cash flows from investing activities:
Purchases of property and equipment	(31,855)	(44,714)
Purchases of capitalized data and other intangible assets	(18,535)	(18,307)
Cash paid for acquisitions, net of cash acquired	(12,046)	(41)
Purchases of investments	(631)	(658)
Cash received from sale of business-lines	0	1,082
Proceeds from investments and other	2,281	1,157
Net cash used in investing activities - continuing operations	(60,786)	(61,481)
Net cash provided by investing activities - discontinued operations	0	0
Total cash used in investing activities	(60,786)	(61,481)
Cash flows from financing activities:
Proceeds from long-term debt	0	1,770,000
Debt issuance costs	0	(9,621)
Repayment of long-term debt	(101,680)	(1,789,702)
Proceeds from issuance of shares in connection with share-based compensation	5,785	6,559
Payment of tax withholdings related to net share settlements	(9,346)	(9,267)
Shares repurchased and retired	(9,273)	(29,030)
Dividends paid	(34,839)	0
Contingent consideration payments subsequent to acquisitions	0	(600)
Net cash used in financing activities - continuing operations	(149,353)	(61,661)
Net cash provided by financing activities - discontinued operations	0	0
Total cash used in financing activities	(149,353)	(61,661)
Effect of exchange rate on cash, cash equivalents, and restricted cash	(1,553)	26
Net change in cash, cash equivalents, and restricted cash	31,446	(2,522)
Cash, cash equivalents, and restricted cash at beginning of period	115,702	98,250
Less: Change in cash, cash equivalents, and restricted cash - discontinued operations	18	0
Plus: Cash swept from discontinued operations	18	0
Cash, cash equivalents, and restricted cash at end of period	147,148	95,728
Supplemental disclosures of cash flow information:
Cash paid for interest	32,095	35,393
Cash paid for income taxes	36,436	9,909
Cash refunds from income taxes	424	16,061
Non-cash investing activities:
Capital expenditures included in accounts payable and other accrued expenses	$ 12,374	$ 17,179