CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net income (loss)	$ (318,705)	$ (512,307)
Adjustments to net income (loss):
Depreciation and amortization	352,052	438,182
Deferred income tax expense (benefit)	(3,649)	29,682
Impairments and other charges	58,710	310,296
Amortization of debt discount and deferred financing costs	10,592	16,208
Losses (gains) on debt buyback	(8,185)	(51,678)
Losses (gains) on long-lived assets, net	17,488	2,428
Losses (gains) on investments, net	(775)	4,733
Provision (recovery) of bad debt	240	10,164
Share-based compensation	10,741	15,756
Foreign currency transaction losses (gains), net	2,499	2,130
Noncontrolling interest	(14,390)	(27,632)
Other	684	352
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	45,385	89,981
Inventory	12,685	(724)
Other current assets	(6,624)	7,926
Other long-term assets	(3,643)	10,273
Trade accounts payable and accrued liabilities	28,324	(127,830)
Income taxes payable	8,697	8,823
Other long-term liabilities	21,077	(24,991)
Net cash provided by (used for) operating activities	213,203	201,772
Cash flows from investing activities:
Purchases of investments	(28)	(16)
Sales and maturities of investments	11,369	1,861
Capital expenditures	(117,785)	(106,766)
Proceeds from sales of assets and insurance claims	21,525	12,772
Net cash (used for) provided by investing activities	(84,919)	(92,149)
Cash flows from financing activities:
Proceeds from issuance of long-term debt		1,000,000
Reduction in long-term debt	(21,800)	(1,218,622)
Debt issuance costs	(2,421)	(16,023)
Proceeds from revolving credit facilities	110,000	1,240,000
Reduction in revolving credit facilities	(225,000)	(1,035,000)
Repurchase of common and preferred shares		(13,858)
Dividends to common and preferred shareholders	(7,315)	(15,232)
Distributions to noncontrolling interest	(50,867)	(1,005)
Other	(1,990)	(1,576)
Net cash (used for) provided by financing activities	(199,393)	(61,316)
Effect of exchange rate changes on cash and cash equivalents	(1,349)	(3,336)
Net increase (decrease) in cash and cash equivalents and restricted cash	(72,458)	44,971
Cash and cash equivalents and restricted cash, beginning of period	475,280	442,038
Cash and cash equivalents and restricted cash, end of period	402,822	487,009
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents, beginning of period	472,246	435,990
Restricted cash, beginning of period	3,034	6,048
Cash and cash equivalents and restricted cash, beginning of period	475,280	442,038
Cash and cash equivalents, end of period	399,881	484,336
Restricted cash, end of period	2,941	2,673
Cash and cash equivalents and restricted cash, end of period	$ 402,822	$ 487,009