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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2016
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)
2016
 
2015
Land
$
10,410

 
$
10,410

Buildings
88,256

 
83,642

Machinery, equipment and fixtures
433,652

 
438,388

Leasehold improvements
209,612

 
205,018

Construction in progress
36,728

 
13,517

 
778,658

 
750,975

Less accumulated depreciation
(544,994
)
 
(519,852
)
 
$
233,664

 
$
231,123


Depreciation expense was $64.6 million, $77.9 million and $74.9 million in 2016, 2015 and 2014, respectively.
The Company capitalized $0.4 million of interest related to the construction of a building in 2016. No interest expense was capitalized in 2015 and 2014.
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. In 2014, as a result of restructuring activities at KHE Campuses, Kaplan recorded an impairment charge of $13.6 million. The Company estimated the fair value of the property, plant and equipment using a market approach.