CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH PROVIDED BY OPERATIONS:
Net income	$ 202,878	$ 126,531
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	200,421	183,323
Deferred income taxes	(9,928)	(5,068)
Provision for pension and postretirement benefits	22,810	27,813
Share-based compensation expense	27,319	20,108
Gain on disposals of property, plant and equipment	(18,979)	(2,678)
Postretirement benefit claims paid	(2,759)	(3,050)
Contributions to pension plans	(18,609)	(41,761)
Asset impairment charges	0	2,896
Write-off of deferred debt issuance costs	0	690
Changes in current assets and liabilities:
Receivables - trade and other	(49,233)	(115,873)
Prepaid expenses and other current assets	(137)	(20,029)
Accounts payable	16,032	(1,115)
Accrued income taxes	(18,653)	(2,259)
Deferred revenues	15,360	(245)
Other current liabilities	(24,118)	10,349
Net changes in other noncurrent assets and liabilities	49,628	9,870
Net cash provided by operations	392,032	189,502
CASH USED IN INVESTING ACTIVITIES:
Capital expenditures	(455,164)	(566,089)
Proceeds from disposals of property, plant and equipment	42,295	10,553
Net cash used in investing activities	(412,869)	(555,536)
CASH PROVIDED BY FINANCING ACTIVITIES:
Proceeds from borrowings	0	493,415
Debt issue costs	0	(799)
Repayments of borrowings	0	(238,453)
Excess tax benefits from share-based compensation	977	1,153
Proceeds from exercise of share options	2,911	155
Other	1,820	0
Net cash provided by financing activities	5,708	255,471
DECREASE IN CASH AND CASH EQUIVALENTS	(15,129)	(110,563)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1,024,008	438,853
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 1,008,879	$ 328,290