Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 348,003	$ 464,393
Marketable securities	801,931	612,346
Accounts receivable, net of allowance for bad debts	622,949	609,606
Prepaid expenses and other current assets	157,389	177,153
Total current assets	1,930,272	1,863,498
Drilling and other property and equipment, net of accumulated depreciation	4,605,748	4,283,792
Long-term receivable	0	35,361
Other assets	303,215	544,333
Total assets	6,839,235	6,726,984
Current liabilities:
Accounts payable	59,169	99,236
Accrued liabilities	279,209	469,190
Taxes payable	34,583	57,862
Total current liabilities	372,961	626,288
Long-term debt	1,495,765	1,495,593
Deferred tax liability	519,980	542,258
Other liabilities	189,914	201,133
Total liabilities	2,578,620	2,865,272
Commitments and contingencies (Note 9)
Stockholders' equity:
Common stock (par value $0.01, 500,000,000 shares authorized; 143,944,009 shares issued and 139,027,209 shares outstanding at September 30, 2011; 143,943,624 shares issued and 139,026,824 shares outstanding at December 31, 2010)	1,439	1,439
Additional paid-in capital	1,976,294	1,972,550
Retained earnings	2,406,188	1,998,995
Accumulated other comprehensive gain (loss)	(8,893)	3,141
Treasury stock, at cost (4,916,800 shares at September 30, 2011 and December 31, 2010)	(114,413)	(114,413)
Total stockholders' equity	4,260,615	3,861,712
Total liabilities and stockholders' equity	$ 6,839,235	$ 6,726,984