CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH PROVIDED BY OPERATIONS:
Net income (loss)	$ (114,852)us-gaap_NetIncomeLoss	$ 252,576us-gaap_NetIncomeLoss	$ 180,602us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operations:
Depreciation and amortization	322,641	271,008	247,900
Provision for pension and postretirement benefits	25,117	32,010	39,484
Share-based compensation expense	34,547us-gaap_ShareBasedCompensation	33,931us-gaap_ShareBasedCompensation	24,808us-gaap_ShareBasedCompensation
Other postretirement benefit claims paid	(4,125)	(3,470)	(3,811)
Gain on disposals of property, plant and equipment	(3,691)us-gaap_GainLossOnDispositionOfAssets	(20,119)us-gaap_GainLossOnDispositionOfAssets	(2,502)us-gaap_GainLossOnDispositionOfAssets
Deferred income taxes	(182,544)	(33,559)	(4,649)
Contributions to pension plans	(54,834)us-gaap_PensionContributions	(18,860)us-gaap_PensionContributions	(42,055)us-gaap_PensionContributions
Write-off of deferred debt issuance costs	0	0	690
Asset impairment charges	573,950us-gaap_AssetImpairmentCharges	4,453us-gaap_AssetImpairmentCharges	12,038us-gaap_AssetImpairmentCharges
Changes in current assets and liabilities:
Receivables - trade and other	(200,658)	30,784	(105,762)
Prepaid expenses and other current assets	16,328	9,583	(9,879)
Accounts payable	(20,629)	32,373	(8,608)
Accrued income taxes	4,891	(17,714)	16,210
Deferred revenues	(18,326)	2,175	16,120
Other current liabilities	72,897	(12,441)	17,873
Net changes in other noncurrent assets and liabilities	(27,753)	60,446	15,250
Net cash provided by operations	422,959	623,176	393,709
CASH USED IN INVESTING ACTIVITIES:
Capital expenditures	(1,958,227)	(607,311)	(685,256)
Proceeds from disposals of property, plant and equipment	21,987us-gaap_ProceedsFromRemovalCosts	44,550us-gaap_ProceedsFromRemovalCosts	10,500us-gaap_ProceedsFromRemovalCosts
Net cash used in investing activities	(1,936,240)	(562,761)	(674,756)
CASH PROVIDED BY FINANCING ACTIVITIES:
Proceeds from borrowings	793,380	0	1,104,929
Dividends paid	(37,695)us-gaap_PaymentsOfDividends	0us-gaap_PaymentsOfDividends	0us-gaap_PaymentsOfDividends
Debt issue costs	(687)us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts	(2,026)us-gaap_PaymentsOfDebtIssuanceCosts
Repayments of borrowings	0us-gaap_RepaymentsOfDebt	0us-gaap_RepaymentsOfDebt	(238,453)us-gaap_RepaymentsOfDebt
Proceeds from exercise of share options	4,725	2,911	588
Excess tax benefits from share-based compensation	(132)	3,690	1,164
Other	0	1,820	0
Net cash provided by financing activities	759,591	8,421	866,202
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(753,690)	68,836	585,155
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1,092,844	1,024,008	438,853
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 339,154	$ 1,092,844	$ 1,024,008

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-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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Balance Type:	debit
Period Type:	duration