CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH PROVIDED BY OPERATIONS:
Net income	$ 123,669us-gaap_NetIncomeLoss	$ 59,595us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	90,564	70,873
Deferred income taxes	(7,541)us-gaap_DeferredIncomeTaxExpenseBenefit	(1,489)us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for pension and other postemployement benefits	7,844	6,170
Share-based compensation expense	5,190us-gaap_ShareBasedCompensation	7,547us-gaap_ShareBasedCompensation
Gain on disposals of property, plant and equipment	(513)us-gaap_GainLossOnDispositionOfAssets	(1,110)us-gaap_GainLossOnDispositionOfAssets
Other postemployment benefit claims paid	(1,115)	(894)
Contributions to pension plans	(375)us-gaap_PensionContributions	(6,448)us-gaap_PensionContributions
Changes in current assets and liabilities:
Receivables - trade and other	42,053	(39,090)
Prepaid expenses and other current assets	4,350	12,248
Accounts payable	6,894	(13,637)
Accrued income taxes	12,300	9,222
Deferred revenues	1,163	(13,502)
Other current liabilities	(47,075)	(11,037)
Net changes in other noncurrent assets and liabilities	7,358	2,075
Net cash provided by operations	244,766	80,523
CASH USED IN INVESTING ACTIVITIES:
Capital expenditures	(514,265)	(532,518)
Proceeds from disposals of property, plant and equipment	1,680us-gaap_ProceedsFromRemovalCosts	6,600us-gaap_ProceedsFromRemovalCosts
Net cash used in investing activities	(512,585)	(525,918)
CASH PROVIDED BY FINANCING ACTIVITIES:
Proceeds from borrowings	0	793,380
Dividends paid	(12,562)us-gaap_PaymentsOfDividends	0us-gaap_PaymentsOfDividends
Debt issue costs	0us-gaap_PaymentsOfDebtIssuanceCosts	(687)us-gaap_PaymentsOfDebtIssuanceCosts
Excess tax benefits (deficit) from share-based compensation	(1,981)	(563)
Proceeds from exercise of share options	0	810
Net cash provided by (used in) financing activities	(14,543)	792,940
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(282,362)	347,545
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	339,154	1,092,844
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 56,792	$ 1,440,389

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