CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 189,487	$ 225,229
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	148,528	142,799
Impairment charges	41,037	0
Stock-based compensation expense	12,110	9,685
Deferred income taxes	41,372	43,617
Equity investment (loss) income, net	(337)	3,564
Other non-cash charges, net	1,720	9,959
Changes in operating assets and liabilities, net of effect of acquisitions and divestitures:
Accounts receivable	(132,292)	(63,701)
Inventories	3,324	57,621
Other receivables and other current assets	1,199	(34,120)
Other long-term assets	(1,997)	2,054
Accounts payable	(38,537)	(62,830)
Accrued compensation and benefits	(173,583)	(62,550)
Other current liabilities	17,236	49,379
Income taxes	32,502	30,772
Other long-term liabilities	(465)	11,061
Net cash provided by operating activities	141,304	362,539
Cash flows from investing activities:
Additions of property and equipment	(198,878)	(232,443)
Acquisitions	(11,274)	(16,582)
Proceeds from asset and business sales	13,903	18,535
Purchase of other debt and equity investments	(3,290)	(2,646)
Purchase of investments held-to-maturity	(209)	(3,586)
Proceeds from sale of other debt and equity investments	3,302	5,151
Proceeds from investments held-to-maturity	0	31,454
Purchase of equity investments	(4,067)	(2,476)
Distributions received on equity investments	155	2,465
Net cash used in investing activities	(200,358)	(200,128)
Cash flows from financing activities:
Borrowings	17,133,464	13,306,898
Payments on long-term debt and other financing costs	(16,776,267)	(13,202,225)
Purchase of treasury stock	0	(290,377)
Distributions to noncontrolling interests	(44,230)	(45,467)
Stock award exercises and other share issuances, net	1,517
Stock award exercises and other share issuances, net		(1,185)
Contributions from noncontrolling interests	18,947	12,009
Purchases of noncontrolling interests	(8,480)	(2,200)
Net cash provided by (used in) financing activities	324,951	(222,547)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(921)	6,668
Net increase (decrease) in cash, cash equivalents and restricted cash	264,976	(53,468)
Cash, cash equivalents and restricted cash of continuing operations at beginning of the year	415,420	518,920
Cash, cash equivalents and restricted cash of continuing operations at end of the period	561,434	447,618
Discontinued Operations
Cash flows from financing activities:
Net increase (decrease) in cash, cash equivalents and restricted cash	118,962	17,834
Continuing Operations
Cash flows from financing activities:
Net increase (decrease) in cash, cash equivalents and restricted cash	$ 146,014	$ (71,302)