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Other Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Other Property and Equipment
Other property and equipment consists of the following:
 
December 31,
 
2015
 
2014
 
(in thousands)
 
 
 
 
Natural gas plant and pipeline
$
480,161

 
$
479,754

Furniture and office equipment
106,462

 
88,893

Buildings and leasehold improvements
72,976

 
49,046

Vehicles
37,641

 
36,534

Drilling and other equipment
7,934

 
6,994

Land
3,537

 
7,928

 
708,711

 
669,149

Less accumulated depreciation
(195,661
)
 
(144,282
)
 
$
513,050

 
$
524,867