Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 279,876	$ 464,393
Marketable securities	700,486	612,346
Accounts receivable, net of allowance for bad debts	592,157	609,606
Prepaid expenses and other current assets	196,689	177,153
Total current assets	1,769,208	1,863,498
Drilling and other property and equipment, net of accumulated depreciation	4,159,542	4,283,792
Long-term receivable	0	35,361
Construction deposits	478,320	154,427
Other assets	323,553	389,906
Total assets	6,730,623	6,726,984
Current liabilities:
Accounts payable	60,535	99,236
Accrued liabilities	278,897	469,190
Taxes payable	30,627	57,862
Total current liabilities	370,059	626,288
Long-term debt	1,495,707	1,495,593
Deferred tax liability	527,903	542,258
Other liabilities	197,357	201,133
Total liabilities	2,591,026	2,865,272
Commitments and contingencies (Note 9)
Stockholders' equity:
Common stock (par value $0.01, 500,000,000 shares authorized; 143,943,839 shares issued and 139,027,039 shares outstanding at June 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	1,975,465	1,972,550
Retained earnings	2,271,609	1,998,995
Accumulated other comprehensive gain	5,497	3,141
Treasury stock, at cost (4,916,800 shares at June 30, 2011 and December 31, 2010)	(114,413)	(114,413)
Total stockholders' equity	4,139,597	3,861,712
Total liabilities and stockholders' equity	$ 6,730,623	$ 6,726,984