Exploratory Well Costs (Capitalized Exploratory Costs And the Number Of Projects For Which Exploratory Costs Have Been Capitalized) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
One year or less	$ 115,955		$ 190,678		$ 107,596
More than one year	42,947		21,992		0
Capitalized exploratory well costs, total suspended	158,902	[1]	212,670	[1]	107,596	[1]	96,193
Number of projects with exploratory well costs that have been suspended for a period greater than one year	1		1		0
Capitalized Exploratory Well Cost, Charged to Expense	49,134	[2]	30,637	[2]	3,256	[2]
Nuna [Member]
More than one year	42,947
Oooguruk [Member]
More than one year			21,992
Capitalized Exploratory Well Cost, Charged to Expense	$ (33,700)

[1] Includes $60.3 million of capitalized exploratory well costs classified as held for sale in the accompanying consolidated balance sheet as of December 31, 2013.

[2] Includes exploration and abandonment expense reclassified as discontinued operations of $43.3 million, $21.6 million, and $180 thousand in 2013, 2012 and 2011, respectively.