CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 1,021,294	$ 333,040	$ 830,555
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	615,152	591,035	777,485
Impairment charges	124,892	61,981	981,589
Valuation adjustment on disposal group	0	316,840	0
Debt prepayment, refinancing, and redemption charges	33,402	0	0
Stock-based compensation expense	67,850	73,061	35,092
Deferred income taxes	41,723	273,660	(395,217)
Equity investment income, net	8,582	26,449	28,925
(Loss) gain on sales of business interests, net	23,022	(85,699)	(23,402)
Other non-cash charges, net	49,579	82,374	66,920
Changes in operating assets and liabilities, net of effect of acquisitions and divestitures:
Accounts receivable	(79,957)	(81,176)	(156,305)
Inventories	10,158	73,505	(18,625)
Other receivables and other current assets	2,790	236,995	(111,432)
Other long-term assets	6,965	3,497	(11,945)
Accounts payable	(84,539)	(35,959)	26,876
Accrued compensation and benefits	(14,697)	84,165	(78,239)
Other current liabilities	181,940	(157,462)	1,908
Income taxes	95,645	(23,635)	(52,176)
Other long-term liabilities	(31,446)	(1,031)	11,157
Net cash provided by operating activities	2,072,355	1,771,640	1,913,166
Cash flows from investing activities:
Additions of property and equipment	(766,546)	(987,138)	(905,250)
Acquisitions	(100,861)	(183,156)	(803,879)
Proceeds from asset and business sales	3,877,392	150,205	92,336
Purchase of other debt and equity investments	(5,458)	(8,448)	(13,117)
Purchase of investments held-to-maturity	(101,462)	(5,963)	(228,990)
Proceeds from sale of other debt and equity investments	3,676	9,526	6,408
Proceeds from investments held-to-maturity	95,376	34,862	492,470
Purchase of equity investments	(9,366)	(19,177)	(4,816)
Distributions received on equity investments	2,589	3,646	106
Net cash provided by (used in) investing activities	2,995,340	(1,005,643)	(1,364,732)
Cash flows from financing activities:
Borrowings	38,525,850	59,934,750	50,991,960
Payments on long-term debt and other financing costs	(40,606,041)	(59,239,973)	(50,837,112)
Purchase of treasury stock	(2,383,816)	(1,161,511)	(802,949)
Distributions to noncontrolling interests	(233,123)	(196,441)	(211,467)
Stock award exercises and other share issuances, net	11,382	13,577	21,252
Contributions from noncontrolling interests	57,317	52,311	74,552
Proceeds from sales of additional noncontrolling interests	0	15	2,864
Purchases of noncontrolling interests	(68,019)	(28,082)	(5,357)
Net cash used in financing activities	(4,696,450)	(625,354)	(766,257)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1,760)	(3,350)	254
Less: Net increase (decrease) in cash, cash equivalents and restricted cash from discontinued operations	369,485	137,293	(217,569)
Cash, cash equivalents and restricted cash of continuing operations at beginning of the year	415,420	518,920	683,463
Cash, cash equivalents and restricted cash of continuing operations at end of the year	1,208,718	415,420	518,920
Discontinued Operations
Cash flows from financing activities:
Less: Net increase (decrease) in cash, cash equivalents and restricted cash from discontinued operations	(423,813)	240,793	(53,026)
Continuing Operations
Cash flows from financing activities:
Less: Net increase (decrease) in cash, cash equivalents and restricted cash from discontinued operations	$ 793,298	$ (103,500)	$ (164,543)