CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income (loss)	$ (372,294)	$ (669,244)	$ 147,162
Adjustments to net income (loss):
Depreciation and amortization	970,442	1,145,328	1,099,741
Accretion, depletion and other exploratory expenses	2,876	2,981	22,270
Deferred income tax expense (benefit)	(203,145)	(240,195)	(103,277)
Deferred financing costs amortization	5,290	4,231	4,255
Discount amortization on long-term debt	1,969	3,131	2,137
Impairments and other charges	129,341	650,199	53,905
Loss on debt extinguishment		5,576	211,981
Losses (gains) on long-lived assets, net	63,338	353,110	18,060
Losses (gains) on investments, net		(5,580)	(91,480)
Losses (gains) on other than temporary impairment	180,591
Losses (gains) on merger and acquisitions	49,382
Share-based compensation	47,313	37,190	53,255
Foreign currency transaction losses (gains), net	9,881	1,021	6,225
Equity in (earnings) losses of unconsolidated affiliates, net of dividends	84,275	7,102	800
Other	627	(762)	(9,730)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	529,151	(126,883)	(44,561)
Inventory	23,852	(65,398)	39,412
Other current assets	34,390	118,162	(6,943)
Other long-term assets	(27,461)	(30,475)	42,298
Trade accounts payable and accrued liabilities	(566,042)	267,907	113,550
Income taxes payable	(1,680)	(57,113)	(31,752)
Other long-term liabilities	(6,776)	381,623	(109,085)
Net cash provided by operating activities	856,556	1,781,911	1,418,223
Cash flows from investing activities:
Purchases of investments	(9)	(319)
Sales and maturities of investments	961	23,992	164,510
Proceeds from sales of unconsolidated affiliates		750	12,640
Cash paid for acquisition of businesses, net	(80,187)	(72,534)	(116,971)
Investments in unconsolidated affiliates	(445)	(2,365)	(5,967)
Capital expenditures	(867,106)	(1,821,315)	(1,178,205)
Proceeds from sales of assets and insurance claims	68,206	156,761	308,538
Proceeds from merger transaction	650,050
Other Changes in Investing	1,081	(1,879)	(13)
Net cash used for investing activities	(227,449)	(1,716,909)	(815,468)
Cash flows from financing activities:
Increase (decrease) in cash overdrafts	645	(6,151)	(4,421)
Proceeds from issuance of long-term debt			698,753
Debt issuance costs	(1,847)		(4,500)
Proceeds from revolving credit facilities		465,000
Reduction in revolving credit facilities	(450,000)	(230,932)	(720,000)
Proceeds from (payments for) issuance of common shares	1,296	30,263	5,383
Repurchase of common shares	(99,598)	(250,037)
Purchase of preferred stock		(70,875)
Reduction in long-term debt	27,478		994,181
Dividends to shareholders	(69,363)	(59,145)	(47,168)
Proceeds from (payment for) commercial paper, net	(525,119)	203,275	329,844
Proceeds from long term debt			698,753
Proceeds from Issuance of Debt	625,000
Payments on term loan	(300,000)
Cash proceeds from noncontrolling Interest	3,972
Other	(7,449)	(11,550)	6,704
Net cash (used for) provided by financing activities	(849,941)	69,848	(729,586)
Effect of exchange rate changes on cash and cash equivalents	(25,785)	(23,616)	(8,176)
Net increase (decrease) in cash and cash equivalents	(246,619)	111,234	(135,007)
Cash and cash equivalents, beginning of period	501,149	389,915	524,922
Cash and cash equivalents, end of period	$ 254,530	$ 501,149	$ 389,915