CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income (loss)	$ (339,461)	$ (279,047)
Adjustments to net income (loss):
Depreciation and amortization	432,782	413,072
Deferred income tax expense (benefit)	33,921	(83,294)
Deferred financing costs amortization	4,055	3,516
Discount amortization on long-term debt	10,619	9,787
Losses (gains) on debt buyback		15,944
Losses (gains) on long-lived assets, net	69,481	124
Losses (gains) on investments, net	4,969	1,342
Provisions for bad debt	(2,663)	376
Share-based compensation	14,732	18,045
Foreign currency transaction losses (gains), net	6,280	2,491
Equity in (earnings) losses of unconsolidated affiliates, net of dividends	(1)	(2)
Other	(3,109)	(2,636)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	(86,968)	(89,340)
Inventory	(7,153)	(4,125)
Other current assets	21,463	(8,137)
Other long-term assets	18,773	29,569
Trade accounts payable and accrued liabilities	(21,824)	75,961
Income taxes payable	(22,429)	12,718
Other long-term liabilities	(56,110)	(125,894)
Net cash (used for) provided by operating activities	77,357	(9,530)
Cash flows from investing activities:
Purchases of investments	(676)	(4,489)
Sales and maturities of investments	2,602	12,429
Capital expenditures	(209,471)	(315,769)
Proceeds from sales of assets and insurance claims	77,272	18,796
Net cash (used for) provided by investing activities	(130,273)	(289,033)
Cash flows from financing activities:
Increase (decrease) in cash overdrafts	(344)	(42)
Proceeds from issuance of long-term debt	800,000	411,200
Debt issuance costs	(12,990)	(11,037)
Proceeds from revolving credit facilities	625,000	100,000
Reduction in revolving credit facilities	(1,135,000)
Proceeds from issuance of common shares, net of issuance costs	302,014	8,300
Proceeds from issuance of preferred stock, net of issuance costs	278,573
Distributions to noncontrolling interest	(4,676)	(6,982)
Noncontrolling interest contribution		20,000
Reduction in long-term debt	(460,837)	(377,983)
Dividends to shareholders	(36,200)	(34,197)
Proceeds from (payment for) commercial paper	(40,000)	171,985
Cash proceeds from equity component of exchangeable debt		159,952
Payments on term loan		(162,500)
Proceeds from (payments for) short-term borrowings	62	(173)
Purchase of capped call hedge transactions		(40,250)
Other	(3,688)	(7,844)
Net cash (used for) provided by financing activities	311,914	230,429
Effect of exchange rate changes on cash and cash equivalents	(3,637)	992
Net increase (decrease) in cash and cash equivalents	255,361	(67,142)
Cash, cash equivalents and restricted cash, beginning of period	342,029	264,990
Cash, cash equivalents and restricted cash, end of period	597,390	197,848
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, cash equivalents and restricted cash, beginning of period	342,029	264,990
Cash and cash equivalents, end of period	593,284	196,567
Restricted cash, end of period	4,106	1,281
Cash, cash equivalents and restricted cash, end of period	$ 597,390	$ 197,848

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Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow from issuance of preferred stocks identified as being convertible into another form of financial instrument, typically the entity's common stock.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

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Amount of cash inflow (outflow) from financing activities classified as other.

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The net cash inflow or outflow from the excess drawing from an existing cash balance, which will be honored by the bank but reflected as a loan to the drawer.

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The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

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The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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No definition available.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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