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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment consist of the following:
 
As of December 31
(in thousands)
2018
 
2017
Land
$
15,965

 
$
16,190

Buildings
108,683

 
107,932

Machinery, equipment and fixtures
382,064

 
387,914

Leasehold improvements
206,170

 
215,445

Construction in progress
68,064

 
16,649

 
780,946

 
744,130

Less accumulated depreciation
(487,861
)
 
(484,772
)
 
$
293,085

 
$
259,358


Depreciation expense was $56.7 million, $62.5 million and $64.6 million in 2018, 2017 and 2016, respectively.
The Company capitalized $0.8 million, $0.3 million, and $0.4 million of interest related to the construction of buildings in 2018, 2017 and 2016, respectively.
In the third quarter of 2018, GHG recorded an impairment charge of $0.2 million. In the second quarter of 2017, as a result of a challenging operating environment, Forney recorded a $0.6 million impairment charge. In the third quarter of 2017, GHG recorded an impairment charge of $0.4 million. The Company estimated the fair value of the property, plant and equipment using a market approach. Forney is included in other businesses.