CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net income (loss)	$ (512,307)	$ (296,368)
Adjustments to net income (loss):
Depreciation and amortization	438,182	428,717
Deferred income tax expense (benefit)	29,682	8,804
Impairments and other charges	310,296	98,869
Amortization of debt discount and deferred financing costs	16,208	15,868
Losses (gains) on debt buyback	(51,678)	1,034
Losses (gains) on long-lived assets, net	2,428	10,611
Losses (gains) on investments, net	4,733	(5,906)
Provision (recovery) of bad debt	10,164	256
Share-based compensation	15,756	14,164
Foreign currency transaction losses (gains), net	2,130	9,924
Noncontrolling interest	(27,632)	(24,906)
Other	352	373
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	89,981	23,788
Inventory	(724)	(12,814)
Other current assets	7,926	34,590
Other long-term assets	10,273	(38,705)
Trade accounts payable and accrued liabilities	(127,830)	(60,624)
Income taxes payable	8,823	7,118
Other long-term liabilities	(24,991)	58,292
Net cash provided by (used for) operating activities	201,772	273,085
Cash flows from investing activities:
Purchases of investments	(16)	(4,572)
Sales and maturities of investments	1,861	11,919
Cash paid for acquisition of businesses, net of cash acquired		(2,929)
Capital expenditures	(106,766)	(274,479)
Proceeds from sales of assets and insurance claims	12,772	11,857
Net cash (used for) provided by investing activities	(92,149)	(258,204)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	1,000,000
Reduction in long-term debt	(1,218,622)	(361,966)
Debt issuance costs	(16,023)	(49)
Proceeds from revolving credit facilities	1,240,000	790,000
Reduction in revolving credit facilities	(1,035,000)	(480,000)
Proceeds from (payments for) short-term borrowings		229
Repurchase of common and preferred shares	(13,858)
Dividends to common and preferred shareholders	(15,232)	(33,705)
Distributions to noncontrolling interest	(1,005)	(814)
Other	(1,576)	(2,337)
Net cash (used for) provided by financing activities	(61,316)	(88,642)
Effect of exchange rate changes on cash and cash equivalents	(3,336)	(1,968)
Net increase (decrease) in cash and cash equivalents and restricted cash	44,971	(75,729)
Cash and cash equivalents and restricted cash, beginning of period	442,038	451,080
Cash and cash equivalents and restricted cash, end of period	487,009	375,351
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents, beginning of period	435,990	447,766
Restricted cash, beginning of period	6,048	3,314
Cash and cash equivalents and restricted cash, beginning of period	442,038	451,080
Cash and cash equivalents, end of period	484,336	367,693
Restricted cash, end of period	2,673	7,658
Cash and cash equivalents and restricted cash, end of period	$ 487,009	$ 375,351