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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 and related Accumulated Depreciation, including equipment under capital leases, as of December 31, consisted of the following:
 
2016
 
2015
Property, Plant and Equipment:
 
 
 
Land
$
6,328

 
$
4,232

Buildings and improvements
58,577

 
52,118

Machinery and manufacturing equipment
116,221

 
117,197

Office equipment
89,838

 
80,972

Work in progress
27,536

 
24,481

Less: Gross Property, Plant and Equipment held for sale
—

 
(2,189
)
Total Property, Plant and Equipment
$
298,500

 
$
276,811

 
 
 
 
Accumulated Depreciation:
 
 
 
Accumulated Depreciation
$
(186,403
)
 
$
(183,849
)
Add: Accumulated Depreciation on Property, Plant and Equipment held for sale
—

 
1,996

Total Accumulated Depreciation
$
(186,403
)
 
$
(181,853
)
Property, Plant and Equipment, Net
$
112,097

 
$
94,958


We recorded an impairment loss on Green Machines' fixed assets during 2015, totaling $622, due to our strategic decision to hold the assets of the Green Machines product line for sale. This amount was recorded in Accumulated Depreciation as a write off against Property, Plant and Equipment. The impairment charge was included within Impairment of Long-Lived Assets in the Consolidated Statements of Earnings. Further details regarding the sale of our Green Machines outdoor city cleaning line are discussed in Note 4 and Note 6.
Depreciation expense was $17,891 in 2016, $16,550 in 2015 and $17,694 in 2014.