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Plant and Equipment
12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Plant and Equipment
Plant and Equipment

The Partnership’s plant and equipment consist of the following (in thousands):
 
December 31,
2015
 
December 31,
2014
Plant and equipment at cost
$
92,203

 
$
89,759

Construction in process
1,074

 
457

Less accumulated depreciation
(32,038
)
 
(30,123
)
Total plant and equipment, net
$
61,239


$
60,093


Depreciation expense related to the Partnership's plant and equipment totaled $15.9 million, $7.6 million and $6.0 million for the year ended December 31, 2015, 2014 and 2013, respectively. During the second quarter of 2015 the Partnership recorded a $2.3 million impairment expense related to a coal preparation plant and during the fourth quarter of 2015 the Partnership recorded a $4.7 million impairment expense related to coal processing and transportation assets as well as obsolete equipment at our Logan office. The fair value measurement of these impaired assets recorded at fair value were $0.0 million at the end of the reporting period. The Partnership also recorded a $0.7 million impairment expense related to obsolete plant and equipment at VantaCore. During the fourth quarter of 2014, the Partnership recorded $0.8 million in impairment expense related to a coal preparation plant. These impairment charges are included in Asset impairments in the Consolidated Statements of Comprehensive Income for the year ending December 31, 2015 and December 31, 2014, respectively.