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Exploratory Well Costs (Tables)
 12 Months Ended
Dec. 31, 2013
Capitalized Exploratory Well Costs [Abstract]  
Capitalized Exploratory Well And Project Activity
The following table reflects the Company's capitalized exploratory well and project activity during each of the years ended December 31, 2013, 2012 and 2011:
 
 
Year Ended December 31,
 
2013
 
2012
 
2011
 
(in thousands)
Beginning capitalized exploratory well costs
$
212,670

 
$
107,596

 
$
96,193

Additions to exploratory well costs pending the determination of proved reserves
1,219,797

 
926,084

 
524,313

Reclassification due to determination of proved reserves
(1,044,815
)
 
(790,373
)
 
(480,716
)
Disposition of assets sold
(92,855
)
 
—

 
(28,938
)
Impairment of properties
(86,761
)
 
—

 
—

Exploratory well costs charged to exploration and abandonment expense (a)
(49,134
)
 
(30,637
)
 
(3,256
)
Ending capitalized exploratory well costs (b)
$
158,902

 
$
212,670

 
$
107,596

 _______________
(a)
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.
(b)
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.
Capitalized Exploratory Costs And The Number Of Projects For Which Exploratory Costs Have Been Capitalized
The following table provides an aging, as of December 31, 2013, 2012 and 2011 of capitalized exploratory costs and the number of projects for which exploratory well costs have been capitalized for a period greater than one year, based on the date drilling was completed:
 
 
Year Ended December 31,
 
2013
 
2012
 
2011
 
(in thousands, except well counts)
Capitalized exploratory well costs that have been suspended:
 
 
 
 
 
One year or less
$
115,955

 
$
190,678

 
$
107,596

More than one year
42,947

 
21,992

 
—

 
$
158,902

 
$
212,670

 
$
107,596

Number of projects with exploratory well costs that have been suspended for a period greater than one year
1

 
1

 
—