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Suspended Exploratory Well Costs (Tables)
 12 Months Ended
Dec. 31, 2016
Extractive Industries [Abstract]  
Suspended Exploratory Well Costs

The following table reflects the changes in capitalized exploratory well costs for the years ended December 31, 2016, 2015 and 2014 (in thousands, except for number of projects):

 

2016

 

2015

 

 

2014

 

Balance at beginning of period

$

4,161

 

$

2,996

 

 

$

6,964

 

Additions to capitalized exploratory well costs pending the determination of proved reserves

 

9,128

 

 

1,165

 

 

 

18,747

 

Reclassifications to wells, facilities and equipment based on determination of proved reserves

 

(5,877

)

 

— 

 

 

 

(15,735

)

Capitalized exploratory well costs charged to expense

 

— 

 

 

— 

 

 

 

(6,980

)

Balance at end of period

 

7,412

 

 

4,161

 

 

 

2,996

 

Less exploratory well costs that have been capitalized for a period of one year or less

 

(7,412

)

 

(1,165

)

 

 

(2,996

)

Capitalized exploratory well costs that have been capitalized for a period greater than one year

$

—

 

$

2,996

 

 

$

—

 

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

 

—

 

 

1

 

 

 

—