CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income (loss)	$ (680,510)	$ (612,726)	$ (540,633)
Adjustments to net income (loss):
Depreciation and amortization	876,103	868,509	845,439
Deferred income tax expense (benefit)	35,894	71,579	9,096
Impairments and other charges	213,404	62,578	42,188
Amortization of debt discount and deferred financing costs	30,931	32,213	27,583
Losses (gains) on debt buyback	(11,468)	5,268	16,005
Losses (gains) on long-lived assets, net	40,346	95,741	19,064
Losses (gains) on investments, net	(1,257)	14,195	972
Provision (recovery) of bad debt	20,626	1,285	3,083
Share-based compensation	24,660	26,396	31,896
Foreign currency transaction losses (gains), net	20,876	4,235	1,604
Noncontrolling interest	(22,375)	(28,222)	(6,178)
Equity in (earnings) losses from unconsolidated affiliates, net of dividends	5	164	(7)
Other	667	720	636
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	276,685	(66,486)	(168,436)
Inventory	(18,695)	(13,981)	(17,444)
Other current assets	5,157	31,770	16,518
Other long-term assets	13,106	11,717	28,772
Trade accounts payable and accrued liabilities	(142,857)	(76,561)	79,204
Income taxes payable	(4,857)	(41,939)	14,811
Other long-term liabilities	8,117	(60,682)	(341,417)
Net cash provided by (used for) operating activities	684,558	325,773	62,756
Cash flows from investing activities:
Purchases of investments	(4,323)	(676)	(6,722)
Sales and maturities of investments	18,849	4,287	13,069
Cash paid for acquisition of businesses, net of cash acquired	(2,929)	(20,859)	12,319
Capital expenditures	(427,741)	(458,938)	(574,467)
Proceeds from sales of assets and insurance claims	60,288	109,098	57,933
Net cash (used for) provided by investing activities	(355,856)	(367,088)	(497,868)
Cash flows from financing activities:
Proceeds from issuance of long-term debt		800,000	411,200
Reduction in long-term debt	(455,360)	(878,278)	(381,814)
Debt issuance costs	(1,767)	(21,277)	(11,043)
Proceeds from revolving credit facilities	1,050,000	1,135,000	725,000
Reduction in revolving credit facilities	(865,000)	(1,475,000)	(215,000)
Proceeds from (payment for) commercial paper		(40,000)	40,000
Cash proceeds (payments) from equity component of exchangeable debt			159,952
Purchase of capped call hedge transactions			(40,250)
Payments on term loan			(162,500)
Proceeds from short-term borrowings		380
Payments for short-term borrowings	(561)		(543)
Proceeds from issuance of common shares, net of issuance costs		301,404	8,300
Proceeds from issuance of preferred stock, net of issuance costs		277,927
Repurchase of common shares			(18,071)
Dividends to common and preferred shareholders	(49,583)	(87,098)	(68,503)
Redeemable noncontrolling interest contribution		156,935	61,123
Noncontrolling interest contribution			20,000
Distributions to noncontrolling interest	(4,552)	(5,452)	(7,272)
Other	(4,750)	(8,912)	(8,399)
Net cash (used for) provided by financing activities	(331,573)	155,629	512,180
Effect of exchange rate changes on cash and cash equivalents	(6,171)	(5,263)	(29)
Net increase (decrease) in cash and cash equivalents and restricted cash	(9,042)	109,051	77,039
Cash and cash equivalents and restricted cash, beginning of period	451,080	342,029	264,990
Cash and cash equivalents and restricted cash, end of period	442,038	451,080	342,029
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents, beginning of period	447,766	336,997	264,093
Restricted cash, beginning of period	3,314	5,032	897
Cash and cash equivalents and restricted cash, beginning of period	451,080	342,029	264,990
Cash and cash equivalents, end of period	435,990	447,766	336,997
Restricted cash, end of period	6,048	3,314	5,032
Cash and cash equivalents and restricted cash, end of period	$ 442,038	$ 451,080	$ 342,029