CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 500,285	$ 138,159
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	190,206	169,355
Goodwill and asset impairment charges	39,366	77,000
Stock-based compensation expense	9,601	13,097
Deferred income taxes	20,091	47,519
Equity investment income, net	1,423	5,238
Other non-cash charges	9,467	11,507
Changes in operating assets and liabilities, other than from acquisitions and divestitures:
Accounts receivable	16,168	(78,097)
Inventories	(8,909)	(4,924)
Other receivables and other current assets	(84,511)	(75,326)
Other long-term assets	(2,310)	(965)
Accounts payable	(26,214)	7,782
Accrued compensation and benefits	(62,825)	(32,909)
Other current liabilities	(9,633)	55,673
Income taxes	258,490	76,685
Other long-term liabilities	14,479	19,208
Net cash provided by (used in) operating activities	865,174	429,002
Cash flows from investing activities:
Additions of property and equipment	(214,535)	(173,187)
Acquisitions	(77,236)	(405,154)
Proceeds from asset and business sales	46,612	4,657
Purchase of investments available for sale	(2,358)	(4,435)
Purchase of investments held-to-maturity	(121,670)	(228,198)
Proceeds from sale of investments available for sale	4,025	5,155
Proceeds from investments held-to-maturity	116,285	252,701
Purchase of equity investments	(1,135)	(5,850)
Net cash used in investing activities	(250,012)	(554,311)
Cash flows from financing activities:
Borrowings	12,803,015	13,098,553
Payments on long-term debt and other financing costs	(12,839,156)	(13,118,741)
Purchase of treasury stock	0	(274,926)
Distributions to noncontrolling interests	(43,316)	(50,409)
Stock award exercises and other share issuances, net	3,330	3,167
Contributions from noncontrolling interests	17,989	10,190
Proceeds from sales of additional noncontrolling interests	0	3,557
Purchase of noncontrolling interests	(799)	(4,300)
Deferred financing costs	0	(188)
Net cash (used in) provided by financing activities	(58,937)	(333,097)
Effect of exchange rate changes on cash and cash equivalents	2,820	717
Net increase (decrease) in cash	559,045	(457,689)
Cash and cash equivalents at beginning of period	913,187	1,499,116
Cash and cash equivalents at end of period	$ 1,472,232	$ 1,041,427