Interest And Other Income (Interest And Other Income) (Details) (USD $) In Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Interest And Other Income
Alaskan Petroleum Production Tax credits			$ 13,613	[1]	$ 27,452	[1]	$ 27,861	[1]
Third-party income from vertical integration services	13,725	[2]	998	[2]	16,603	[2]	1,507	[2]
Deferred compensation plan income	299		174		1,166		684
Other income	1,912		1,131		2,913		1,783
Eagle Ford Shale land fees	1,802				1,802
Equity interest in income of unconsolidated affiliate	502				801
Interest income	214		92		404		476
Sales and other tax refunds			944				984
Insurance claim recovery							1,665
Total interest and other income	$ 18,454		$ 16,952		$ 51,141		$ 34,960

[1] The Company earns Alaskan Petroleum Production Tax ("PPT") credits on qualifying capital expenditures. The Company recognizes income from PPT credits when they are realized through cash refunds.

[2] Third-party income from vertical integration services primarily represents income associated with Company-provided fracture stimulation, drilling and related services.