CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income (loss)	$ (1,029,607)	$ (372,294)	$ (669,244)
Adjustments to net income (loss):
Depreciation and amortization	874,296	973,318	1,148,309
Deferred income tax expense (benefit)	(206,670)	(203,145)	(240,195)
Impairments and other charges	236,745	129,341	650,199
Deferred financing costs amortization	4,381	5,290	4,231
Discount amortization on long-term debt	2,074	1,969	3,131
Losses (gains) on debt buyback	6,665		(5,576)
Losses (gains) on long-lived assets, net	85,064	63,338	353,110
Losses (gains) on investments, net			(5,580)
Impairments on equity method holdings	216,242	180,591
Losses (gains) on merger and acquisitions		(49,382)
Share-based compensation	32,000	47,313	37,190
Foreign currency transaction losses (gains), net	5,669	9,881	1,021
Pension Buy-out	3,059
Equity in losses of unconsolidated affiliates, net of dividends	221,914	84,275	7,102
Other	1,333	627	(762)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	250,400	529,151	(126,883)
Inventory	40,647	23,852	(65,398)
Other current assets	37,904	34,390	118,162
Other long-term assets	98	(27,461)	(30,475)
Trade accounts payable and accrued liabilities	(180,200)	(566,042)	267,907
Income taxes payable	(46,576)	(1,680)	(57,113)
Other long-term liabilities	(10,203)	(6,776)	381,623
Net cash provided by operating activities	531,905	856,556	1,781,911
Cash flows from investing activities:
Purchases of investments	(24)	(9)	(319)
Sales and maturities of investments	739	961	23,992
Proceeds from sales of unconsolidated affiliates			750
Cash paid for acquisition of businesses, net of cash acquired	(22,278)	(80,187)	(72,534)
Investment in unconsolidated affiliates		(445)	(2,365)
Capital expenditures	(395,455)	(867,106)	(1,821,315)
Proceeds from sales of assets and insurance claims	34,831	68,206	156,761
Proceeds from merger transaction		650,050
Other	64	1,081	(1,879)
Net cash (used for) provided by investing activities	(382,123)	(227,449)	(1,716,909)
Cash flows from financing activities:
Increase (decrease) in cash overdrafts	3	645	(6,151)
Proceeds from Issuance of Long-term Debt	600,000
Debt issuance costs	(11,520)	(1,847)
Proceeds from revolving credit facilities	611,500		465,000
Reduction in revolving credit facilities	(611,500)	(450,000)	(230,932)
Proceeds from (payments for) issuance of common shares	967	1,296	30,263
Repurchase of common shares	(1,687)	(99,598)	(250,037)
Purchase of preferred stock			(70,875)
Reduction in long term debt	(493,612)	(27,478)	(46,800)
Dividends to shareholders	(50,924)	(69,363)	(59,145)
Proceeds from (payment for) commercial paper, net	(8,000)	(525,119)	203,275
Proceeds from term Loan		625,000
Payments on term loan	(162,500)	(300,000)
Proceeds from (payments for) short-term borrowings	(6,211)	318
Cash proceeds from noncontrolling Interest		3,972
Other	(4,732)	(7,767)	(11,550)
Net cash (used for) provided by financing activities	(138,216)	(849,941)	69,848
Effect of exchange rate changes on cash and cash equivalents	(2,003)	(25,785)	(23,616)
Net increase (decrease) in cash and cash equivalents	9,563	(246,619)	111,234
Cash and cash equivalents, beginning of period	254,530	501,149	389,915
Cash and cash equivalents, end of period	$ 264,093	$ 254,530	$ 501,149