CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
CASH PROVIDED BY (USED IN) OPERATIONS:
Net income	$ 691,740	$ 222,710
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	150,236	139,303
Material charges (Note 2)	0	42,024
Deferred income taxes	(30,880)	12,246
Provision for pension and postretirement benefits	12,059	29,112
Stock-based compensation expense	14,264	11,330
Gain on disposals of property, plant and equipment	(3,932)	575
Gain on sale of manufacturing operations	(662,448)	0
Gain on sale of land drilling operations	(214,803)	0
Postretirement benefit claims paid	(2,188)	(2,474)
Contributions to pension plans	(53,169)	(49,688)
Changes in current assets and liabilities:
Receivables - trade and other	(41,570)	(23,825)
Inventories	(104,468)	27,336
Prepaid expenses and other current assets	(3,538)	(7,538)
Accounts payable	60,785	(9,981)
Accrued income taxes	212,352	(33,274)
Deferred revenues	44,929	(39,326)
Billings in excess of costs and estimated profits on uncompleted contracts	29,493	(17,147)
Other current liabilities	(7,449)	(10,748)
Net changes in other noncurrent assets and liabilities	36,596	(10,354)
Net cash provided by operations	128,009	280,281
CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Capital expenditures	(1,155,108)	(316,561)
Proceeds from sale of manufacturing operations	1,050,720	0
Proceeds from sale of land drilling operations	509,818	0
Decrease in restricted cash	15,265	0
Net cash used in acquisition of SKDP	0	(17,681)
Proceeds from disposals of property, plant and equipment	5,478	2,953
Net cash provided by (used in) investing activities	426,173	(331,289)
CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Proceeds from borrowings, net of issue costs	0	395,517
Repayments of borrowings	(38,412)	(96,061)
Payments to acquire treasury stock	(80,924)	0
Excess tax benefits from stock-based compensation	5,128	(42)
Proceeds from stock options and other	15,107	4,675
Net cash (used in) provided by financing activities	(99,101)	304,089
INCREASE IN CASH AND CASH EQUIVALENTS	455,081	253,081
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	437,479	639,681
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 892,560	$ 892,762