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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2017
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)
2017
 
2016
Land
$
16,190

 
$
10,410

Buildings
107,932

 
88,256

Machinery, equipment and fixtures
387,914

 
433,652

Leasehold improvements
215,445

 
209,612

Construction in progress
16,649

 
36,728

 
744,130

 
778,658

Less accumulated depreciation
(484,772
)
 
(544,994
)
 
$
259,358

 
$
233,664


Depreciation expense was $62.5 million, $64.6 million and $77.9 million in 2017, 2016 and 2015, respectively.
The Company capitalized $0.3 million and $0.4 million of interest related to the construction of a building in 2017 and 2016, respectively. No interest expense was capitalized in 2015.
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 and GHG are included in other businesses.
In the second quarter of 2015, as a result of the sale of Kaplan’s KHE Campuses business, Kaplan recorded a $6.9 million impairment charge. The Company estimated the fair value of the property, plant and equipment using a market approach.