CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income	$ 287,895	$ 189,487
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	154,679	148,528
Impairment charges	0	41,037
Debt refinancing charges	884	0
Stock-based compensation expense	19,870	12,110
Deferred income taxes	103,301	41,372
Equity investment loss, net	(9,482)	(337)
Other non-cash charges, net	5,055	1,720
Changes in operating assets and liabilities, net of effect of acquisitions and divestitures:
Accounts receivable	(32,966)	(132,292)
Inventories	1,835	3,324
Other receivables and other current assets	(24,965)	1,199
Other long-term assets	2,673	(1,997)
Accounts payable	(24,045)	(38,537)
Accrued compensation and benefits	(96,428)	(173,583)
Other current liabilities	3,982	17,236
Income taxes	(32,616)	32,502
Other long-term liabilities	709	(465)
Net cash provided by operating activities	360,381	141,304
Cash flows from investing activities:
Additions of property and equipment	(154,942)	(198,878)
Acquisitions	(34,107)	(11,274)
Proceeds from asset and business sales	31,518	13,903
Purchase of debt investments held-to-maturity	(5,049)	(209)
Purchase of other debt and equity investments	(2,633)	(3,290)
Proceeds from debt investments held-to-maturity	5,049	0
Proceeds from sale of other debt and equity investments	3,268	3,302
Purchase of equity method investments	(6,174)	(4,067)
Distributions from equity method investments	445	155
Net cash used in investing activities	(162,625)	(200,358)
Cash flows from financing activities:
Borrowings	570,779	17,133,464
Payments on long-term debt and other financing costs	(104,942)	(16,776,267)
Purchase of treasury stock	(321,798)	0
Distributions to noncontrolling interests	(58,131)	(44,230)
Stock award exercises and other share issuances, net	2,397	1,517
Contributions from noncontrolling interests	9,387	18,947
Purchases of noncontrolling interests	(700)	(8,480)
Net cash provided by financing activities	96,992	324,951
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(14,978)	(921)
Net increase in cash, cash equivalents and restricted cash	279,770	264,976
Cash, cash equivalents and restricted cash of continuing operations at beginning of the year	1,208,718	415,420
Cash, cash equivalents and restricted cash of continuing operations at end of the period	1,488,488	561,434
Discontinued Operations
Cash flows from financing activities:
Net increase in cash, cash equivalents and restricted cash	0	118,962
Continuing Operations
Cash flows from financing activities:
Net increase in cash, cash equivalents and restricted cash	$ 279,770	$ 146,014