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Property, Plant and Equipment
3 Months Ended
Mar. 31, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment

The following is a summary of property, plant and equipment at March 31, 2019 and December 31, 2018 (in thousands):
 
Estimated
Useful Lives
in Years
 
March 31,
2019
 
December 31,
2018
Land
 
$
32,654

 
$
32,945

Land improvements
8-15
 
8,421

 
8,316

Buildings and improvements
13-39
 
124,684

 
125,088

Rental machinery and equipment
7
 
891,753

 
887,064

Machinery and equipment - other
7
 
61,755

 
61,796

Furniture, fixtures and computers
5
 
24,777

 
24,745

Automobiles and other vehicles
5
 
29,759

 
29,696

Leasehold improvements
7-15, or lease term if shorter
 
15,415

 
15,392

Construction in progress - machinery
     and equipment and land improvements
 
60,841

 
65,152

 
 
 
1,250,059

 
1,250,194

Less: Accumulated depreciation
 
 
(854,941
)
 
(833,704
)
Total property, plant and equipment, net
 
 
$
395,118

 
$
416,490




During the first quarter of 2018, we sold a building classified as held for sale for $0.8 million and recorded an immaterial loss. During the first quarter of 2019, buildings with a net book value of $1.1 million met the criteria to be classified as held for sale and were reclassified from property, plant and equipment to assets held for sale on our condensed consolidated balance sheet.

The following table presents the depreciation and amortization expense associated with each line item for the three months ended March 31, 2019 and 2018 (in thousands):
 
 
Three Months Ended
 
March 31,
 
2019
 
2018
Services
 
$
21,505

 
$
23,579

Products
 
434

 
1,137

General and administrative expenses
 
3,303

 
3,584

Total
 
$
25,242

 
$
28,300