CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH PROVIDED BY (USED IN) OPERATIONS:
Net income	$ 180,602	$ 736,841	$ 279,995
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	247,900	204,872	186,563
Provision for pension and postretirement benefits	39,484	20,115	33,960
Share-based compensation expense	24,808	22,088	15,578
Postretirement benefit claims paid	(3,811)	(2,926)	(3,588)
(Gain) loss on disposals of property, plant and equipment	(2,502)	(4,100)	788
Deferred income taxes	(4,649)	(21,492)	45,164
Contributions to pension plans	(42,055)	(53,394)	(57,266)
Gain on sale of land drilling operations	0	(212,891)	0
Gain on sale of manufacturing operations	0	(670,614)	0
Write-off of deferred debt issuance costs	690	0	0
Material charge	12,038	8,000	42,024
Changes in current assets and liabilities:
Receivables - trade and other	(105,762)	22,825	(34,268)
Inventories	0	(104,468)	65,177
Prepaid expenses and other current assets	(9,879)	303	9,208
Accounts payable	(8,608)	44,784	(34,799)
Accrued income taxes	16,210	(6,097)	(30,555)
Deferred revenues	16,120	41,428	14,048
Billings in excess of costs and estimated profits on uncompleted contracts	0	29,493	(17,311)
Other current liabilities	17,873	10,263	6,381
Net changes in other noncurrent assets and liabilities	15,250	29,649	(12,937)
Net cash provided by operations	393,709	94,679	508,162
CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Capital expenditures	(685,256)	(1,517,674)	(490,560)
Proceeds from sale of manufacturing operations	0	1,041,861	0
Proceeds from sale of land drilling operations, net	0	513,619	0
(Increase) decrease in restricted cash	0	15,265	(15,265)
Proceeds from disposals of property, plant and equipment	10,500	5,734	3,267
Net cash used in acquisition of SKDP	0	0	(17,681)
Net cash provided by (used in) investing activities	(674,756)	58,805	(520,239)
CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Proceeds from borrowings	1,104,929	0	395,517
Debt issue costs	(2,026)	0	0
Repayments of borrowings	(238,453)	(52,166)	(594,013)
Proceeds from exercise of share options	588	19,941	7,959
Excess tax benefits from share-based compensation	1,164	5,128	412
Payments to acquire treasury shares	0	(125,013)	0
Net cash provided by (used in) financing activities	866,202	(152,110)	(190,125)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	585,155	1,374	(202,202)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	438,853	437,479	639,681
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 1,024,008	$ 438,853	$ 437,479