CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
CASH PROVIDED BY OPERATIONS:
Net income	$ (31,043)	$ 212,036
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	290,067	230,054
Deferred income taxes	(722)	(42,678)
Provision for pension and other postretirement benefits	23,796	18,715
Share-based compensation expense	24,594	23,904
Loss (gain) on disposals of property, plant and equipment	2,075	(193)
Other postretirement benefit claims paid	(3,538)	(3,129)
Contributions to pension plans	(10,976)	(54,251)
Asset Impairment Charges	329,781	8,300
Changes in current assets and liabilities:
Receivables - trade and other	36,866	(165,648)
Prepaid expenses and other current assets	(8,276)	4,708
Accounts payable	28,324	(23,162)
Accrued income taxes	3,249	(4,401)
Deferred revenues	12,015	(22,712)
Other current liabilities	(40,147)	18,198
Net changes in other noncurrent assets and liabilities	2,806	481
Net cash provided by operations	658,871	200,222
CASH USED IN INVESTING ACTIVITIES:
Capital expenditures	(674,816)	(1,367,414)
Proceeds from disposals of property, plant and equipment	5,144	9,767
Net cash used in investing activities	(669,672)	(1,357,647)
CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Proceeds from borrowings	220,000	793,380
Repayments of borrowings	(220,000)	0
Dividends paid	(37,872)	(25,123)
Debt issue costs	0	(687)
Excess tax benefit from share-based compensation	0	15
Proceeds from exercise of share options	0	4,725
Net cash provided by (used in) financing activities	(37,872)	772,310
DECREASE IN CASH AND CASH EQUIVALENTS	(48,673)	(385,115)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	339,154	1,092,844
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 290,481	$ 707,729