CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS:
Cash and cash equivalents	$ 1,019,252	$ 1,024,008
Receivables - trade and other	463,805	423,839
Prepaid expenses and other current assets	45,782	55,121
Deferred tax assets - net	26,146	26,628
Assets of discontinued operations	23,430	22,954
Total current assets	1,578,415	1,552,550
PROPERTY, PLANT AND EQUIPMENT:
Drilling equipment	6,803,367	6,764,046
Construction in progress	786,128	756,308
Other property and equipment	145,017	140,739
Property, plant and equipment - gross	7,734,512	7,661,093
Less accumulated depreciation and amortization	1,635,889	1,589,364
Property, plant and equipment - net	6,098,623	6,071,729
Other assets	72,154	75,208
TOTAL ASSETS	7,749,192	7,699,487
CURRENT LIABILITIES:
Accounts payable - trade	64,065	83,004
Deferred revenues	50,250	52,340
Accrued pension and other postretirement benefits	23,392	23,392
Accrued compensation and related employee costs	30,157	43,732
Accrued income taxes	14,138	26,088
Accrued interest	26,042	27,711
Other current liabilities	12,597	16,572
Liabilities of discontinued operations	21,255	21,255
Total current liabilities	241,896	294,094
Long-term debt	2,009,668	2,009,598
Other liabilities	391,651	390,199
Deferred income taxes - net	499,832	473,872
Commitments and contingent liabilities (Note 4)
SHAREHOLDER'S EQUITY:
Class A Ordinary Shares, $0.125 par value, 124,752,407 and 124,740,407 shares issued at March 31, 2013, and December 31, 2012, respectively	15,594	15,593
Additional paid-in capital	1,378,905	1,372,135
Retained earnings	3,435,098	3,366,964
Cost of 584,327 and 529,387 treasury shares at March 31, 2013, and December 31, 2012, respectively	(5,998)	(1,886)
Accumulated other comprehensive loss	(217,454)	(221,082)
Total shareholders' equity	4,606,145	4,531,724
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 7,749,192	$ 7,699,487