CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income (loss)	$ (447,104)	$ (425,466)
Adjustments to net income (loss):
Depreciation and amortization	641,841	630,773
Deferred income tax expense (benefit)	36,164	(114,973)
Impairments and other charges	16,530	35,293
Deferred financing costs amortization	6,287	5,300
Discount amortization on long-term debt	16,024	15,129
Losses (gains) on debt buyback	10,476	16,005
Losses (gains) on long-lived assets, net	74,388	10,180
Losses (gains) on investments, net	7,198	1,342
Provisions for bad debt	(2,568)	(692)
Share-based compensation	20,371	25,057
Foreign currency transaction losses (gains), net	7,870	1,728
Equity in (earnings) losses of unconsolidated affiliates, net of dividends	(1)	(6)
Other	(9,865)	(4,596)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	(82,195)	(127,850)
Inventory	(1,478)	(14,567)
Other current assets	21,724	(6,967)
Other long-term assets	12,883	35,378
Trade accounts payable and accrued liabilities	(160,018)	21,611
Income taxes payable	(23,717)	19,790
Other long-term liabilities	(67,891)	(158,578)
Net cash (used for) provided by operating activities	76,919	(36,109)
Cash flows from investing activities:
Purchases of investments	(676)	(6,722)
Sales and maturities of investments	2,962	12,533
Cash paid for acquisition of businesses, net of cash acquired		(50,764)
Capital expenditures	(338,968)	(448,864)
Proceeds from sales of assets and insurance claims	86,666	32,805
Net cash (used for) provided by investing activities	(250,016)	(461,012)
Cash flows from financing activities:
Increase (decrease) in cash overdrafts	(261)	(78)
Proceeds from issuance of long-term debt	800,000	411,200
Debt issuance costs	(13,262)	(11,039)
Proceeds from revolving credit facilities	905,000	410,000
Reduction in revolving credit facilities	(1,200,000)
Proceeds from issuance of common shares, net of issuance costs	301,835	8,300
Proceeds from issuance of preferred stock, net of issuance costs	278,358
Distributions to noncontrolling interest	(4,676)	(7,272)
Noncontrolling interest contribution		20,000
Reduction in long-term debt	(774,802)	(382,815)
Dividends to common shareholders	(57,661)	(51,346)
Dividends to preferred shareholders	(3,680)
Proceeds from (payment for) commercial paper	(40,000)	78,000
Cash proceeds (payments) from equity component of exchangeable debt		159,952
Payments on term loan		(162,500)
Proceeds from (payments for) short-term borrowings	252	(528)
Purchase of capped call hedge transactions		(40,250)
Other	(3,722)	(7,864)
Net cash (used for) provided by financing activities	187,381	423,760
Effect of exchange rate changes on cash and cash equivalents	(5,320)	251
Net increase (decrease) in cash and cash equivalents	8,964	(73,110)
Cash and cash equivalents and restricted cash, beginning of period	342,029	264,990
Cash and cash equivalents and restricted cash, end of period	350,993	191,880
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents, beginning of period	336,997	264,093
Restricted cash, beginning of period	5,032	897
Cash and cash equivalents and restricted cash, beginning of period	342,029	264,990
Cash and cash equivalents, end of period	347,525	190,556
Restricted cash, end of period	3,468	1,324
Cash and cash equivalents and restricted cash, end of period	$ 350,993	$ 191,880