CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
CURRENT ASSETS:
Cash and cash equivalents	$ 1,024,008	$ 438,853
Receivables - trade and other	423,839	283,592
Prepaid expenses and other current assets	55,121	44,586
Deferred income taxes - net	26,628	27,023
Assets of discontinued operations	22,954	27,661
Total current assets	1,552,550	821,715
PROPERTY, PLANT AND EQUIPMENT:
Drilling equipment	6,764,046	6,179,587
Construction in progress	756,308	711,558
Other property and equipment	140,739	138,177
Property, plant and equipment - gross	7,661,093	7,029,322
Less accumulated depreciation and amortization	1,589,364	1,350,609
Property, plant and equipment - net	6,071,729	5,678,713
Other assets	75,208	97,417
TOTAL ASSETS	7,699,487	6,597,845
CURRENT LIABILITIES:
Current maturities of long-term debt	0	45,023
Accounts payable - trade	83,004	111,082
Deferred revenues	52,340	36,220
Accrued liabilities	137,495	131,041
Liabilities of discontinued operations	21,255	25,005
Total current liabilities	294,094	348,371
Long-term debt - less current maturities	2,009,598	1,089,335
Other liabilities	390,199	357,709
Deferred income taxes - net	473,872	476,443
Commitments and contingent liabilities (Note 7)
SHAREHOLDER'S EQUITY:
Common stock	15,593	15,947
Additional paid-in capital	1,372,135	1,478,233
Retained earnings	3,366,964	3,186,362
Cost of 529,387 and 3,996,465 treasury shares at December 31, 2012 and 2011, respectively	(1,886)	(128,884)
Accumulated other comprehensive loss	(221,082)	(225,671)
Total shareholders' equity	4,531,724	4,325,987
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	7,699,487	6,597,845
Common Class A [Member]
SHAREHOLDER'S EQUITY:
Common stock	$ 0	$ 0