Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income	$ 106,550	$ 128,996	$ 74,467
Less: Loss from discontinued operations, net of tax	(1,466)	(556)	(16,653)
Less: (Loss)/gain from sale of discontinued operations, net of tax	(1,930)	0	112
Income from continuing operations, net of tax	109,946	129,552	91,008
Adjustments to reconcile net income from continuing operations to net cash provided by operating activities:
Depreciation and amortization	172,578	150,377	143,364
Amortization of Debt Issuance Costs	5,785	6,259	7,068
Provision for bad debts and claim losses	18,869	8,260	11,825
Share-based compensation	39,849	35,786	25,379
Tax benefit related to stock options	(2,315)	(6,513)	(6,791)
Equity in earnings of investee, net of taxes	(496)	(13,720)	(14,120)
(Gain)/loss on sale of property and equipment	(31)	24	(13,866)
Loss on early extinguishment of debt	26,624	1,589	763
Deferred income tax	18,213	35,110	20,986
Impairment Loss on Investment in affiliates	23,431	0	360
Tax indemnification release	23,350	0	0
Gain on investments and other, net	(20,573)	(33,181)	(4,242)
Change in operating assets and liabilities, net of acquisitions:
Accounts receivable	(24,391)	(15,400)	13,151
Prepaid expenses and other assets	2,823	7,104	1,231
Accounts payable and accrued expenses	(29,267)	(45,289)	(5,000)
Deferred revenue	53,682	68,410	16,010
Income taxes	28,740	(32,771)	(11,380)
Dividends received from investments in affiliates	9,044	30,084	38,655
Other assets and other liabilities	(41,858)	10,468	21,192
Net cash provided by operating activities - continuing operations	414,003	336,149	335,593
Net cash used in operating activities - discontinued operations	(444)	(7,612)	(13,717)
Total cash provided by operating activities	413,559	328,537	321,876
Cash flows from investing activities:
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(18,023)	0	0
Purchases of property and equipment	(45,211)	(44,149)	(52,025)
Purchases of capitalized data and other intangible assets	(35,507)	(36,409)	(35,129)
Cash paid for acquisitions, net of cash acquired	(396,941)	(194,491)	(694,871)
Cash received from sale of subsidiary, net	0	0	25,366
Purchases of investments	(3,366)	(3,748)	0
Proceeds from Sale and Maturity of Available-for-sale Securities	21,819	0	0
Proceeds from sale of property and equipment	31	137	13,937
Proceeds from Sale, Maturity and Collection of Investments	2,451	0	0
Change in restricted cash	(7,017)	1,434	(310)
Net cash used in investing activities - continuing operations	(481,764)	(277,226)	(743,032)
Net cash provided by investing activities - discontinued operations	0	0	1,536
Total cash used in investing activities	(481,764)	(277,226)	(741,496)
Cash flows from financing activities:
Proceeds from long-term debt	962,000	114,375	690,017
Debt issuance costs	(6,314)	(6,452)	(14,042)
Premium on debt extinguishment payment	16,271	0	0
Repayments of long-term debt	(709,983)	(82,891)	(200,006)
Shares repurchased and retired	(195,003)	(97,430)	(91,475)
Proceeds from issuance of shares in connection with share-based compensation	14,907	22,569	15,213
Minimum tax withholdings related to net share settlements	(10,507)	(15,230)	(15,980)
Tax benefit related to stock options	2,315	6,513	6,791
Net cash provided by/(used in) financing activities - continuing operations	41,144	(58,546)	390,518
Net cash used in financing activities - discontinued operations	0	0	0
Total cash provided by/(used in) financing activities	41,144	(58,546)	390,518
Effect of Exchange Rate on cash	2	2,182	(625)
Net change in cash and cash equivalents	(27,059)	(5,053)	(29,727)
Cash and cash equivalents at beginning of year	99,090	104,677	134,419
Less: Change in cash and cash equivalents of discontinued operations	(444)	(7,612)	(12,181)
Plus: Cash swept to discontinued operations	(444)	(8,146)	(12,196)
Cash and cash equivalents at end of year	72,031	99,090	104,677
Supplemental disclosures of cash flow information:
Cash paid for interest	58,566	64,679	59,376
Cash paid for income taxes	31,382	47,783	5,436
Cash refunds from income taxes	537	3,737	27,545
Capital expenditures included in accounts payable and accrued liabilities	$ 23,108	$ 5,909	$ 4,492