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Property, Plant and Equipment (Tables)
 3 Months Ended
Mar. 31, 2018
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
The following is a summary of property, plant and equipment at March 31, 2018 and December 31, 2017 (in thousands):
 
Estimated
Useful Lives
in Years
 
March 31,
2018
 
December 31,
2017
Land
—
 
$
15,365

 
$
15,314

Land improvements (1)
8-15
 
15,080

 
14,594

Buildings and improvements (1)
39
 
117,003

 
119,380

Rental machinery and equipment
7
 
900,702

 
898,146

Machinery and equipment - other
7
 
55,351

 
55,049

Furniture, fixtures and computers
5
 
27,697

 
27,259

Automobiles and other vehicles
5
 
30,001

 
29,971

Leasehold improvements (1)
7-15, or lease term if shorter
 
11,915

 
10,030

Construction in progress - machinery
     and equipment and land improvements (1)
—
 
61,644

 
61,836

 
 
 
1,234,758

 
1,231,579

Less: Accumulated depreciation
 
 
(785,605
)
 
(761,933
)
Total property, plant and equipment, net
 
 
$
449,153

 
$
469,646


 
 
 

(1) 
See Note 11 - Related Party Transactions for additional information.
Summary of Depreciation and Amortization Expense
The following table presents the depreciation and amortization expense associated with each line item for the three months ended March 31, 2018 and 2017 (in thousands):
 
 
Three Months Ended
 
March 31,
 
2018
 
2017
Services
 
$
23,579

 
$
26,643

Products
 
1,137

 
1,309

General and administrative expenses
 
3,584

 
3,147

Total
 
$
28,300

 
$
31,099