CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income (loss)	$ (296,368)	$ (339,461)
Adjustments to net income (loss):
Depreciation and amortization	428,717	432,782
Deferred income tax expense (benefit)	8,804	33,921
Impairments and other charges	98,869	63,726
Amortization of debt discount and deferred financing costs	15,868	14,674
Losses (gains) on debt buyback	1,034
Losses (gains) on long-lived assets, net	10,611	5,755
Losses (gains) on investments, net	(5,906)	4,969
Provision (recovery) of bad debt	256	(2,663)
Share-based compensation	14,164	14,732
Foreign currency transaction losses (gains), net	9,924	6,280
Noncontrolling interest	(24,906)
Other	373	(3,110)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	23,788	(86,968)
Inventory	(12,814)	(7,153)
Other current assets	34,590	21,463
Other long-term assets	(38,705)	18,773
Trade accounts payable and accrued liabilities	(60,624)	(21,824)
Income taxes payable	7,118	(22,429)
Other long-term liabilities	58,292	(56,110)
Net cash provided by (used for) operating activities	273,085	77,357
Cash flows from investing activities:
Purchases of investments	(4,572)	(676)
Sales and maturities of investments	11,919	2,602
Cash paid for acquisition of businesses, net of cash acquired	(2,929)
Capital expenditures	(274,479)	(209,471)
Proceeds from sales of assets and insurance claims	11,857	77,272
Net cash (used for) provided by investing activities	(258,204)	(130,273)
Cash flows from financing activities:
Increase (decrease) in cash overdrafts		(344)
Proceeds from issuance of long-term debt		800,000
Debt issuance costs	(49)	(12,990)
Proceeds from revolving credit facilities	790,000	625,000
Reduction in revolving credit facilities	(480,000)	(1,135,000)
Proceeds from issuance of common shares, net of issuance costs		302,014
Proceeds from issuance of preferred stock, net of issuance costs		278,573
Distributions to noncontrolling interest	(814)	(4,676)
Reduction in long-term debt	(361,966)	(460,837)
Dividends to common and preferred shareholders	33,705	36,200
Proceeds from (payment for) commercial paper		(40,000)
Proceeds from (payments for) short-term borrowings	229	62
Other	(2,337)	(3,688)
Net cash (used for) provided by financing activities	(88,642)	311,914
Effect of exchange rate changes on cash and cash equivalents	(1,968)	(3,637)
Net increase (decrease) in cash and cash equivalents and restricted cash	(75,729)	255,361
Cash and cash equivalents and restricted cash, beginning of period	451,080	342,029
Cash and cash equivalents and restricted cash, end of period	375,351	597,390
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents, beginning of period	447,766	336,997
Restricted cash, beginning of period	3,314	5,032
Cash and cash equivalents and restricted cash, beginning of period	451,080	342,029
Cash and cash equivalents, end of period	367,693	593,284
Restricted cash, end of period	7,658	4,106
Cash and cash equivalents and restricted cash, end of period	$ 375,351	$ 597,390