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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
The following is a summary of property, plant and equipment at December 31, 2017 and 2016 (in thousands):
 
 
 
December 31,
 
Estimated Useful Lives in Years
 
2017
 
2016
 
 
 
 
 
 
Land
—
 
$
15,314

 
$
15,730

Land improvements (1)
8-15
 
14,594

 
9,379

Buildings and improvements (1)
39
 
119,380

 
73,211

Rental machinery and equipment
7
 
898,146

 
933,667

Machinery and equipment - other
7
 
55,049

 
60,182

Furniture, fixtures and computers
5
 
27,259

 
19,073

Automobiles and other vehicles
5
 
29,971

 
36,796

Aircraft
7
 
—

 
16,267

Leasehold improvements (1)
7-15, or lease term if shorter
 
10,030

 
8,027

Construction in progress - machinery and equipment and buildings (1)
—
 
61,836

 
120,937

 
 
 
1,231,579

 
1,293,269

Less: Accumulated depreciation
 
 
(761,933
)
 
(726,245
)
Total property, plant and equipment, net
 
 
$
469,646

 
$
567,024

 
 
(1) 
See Note 13 - Related Party Transactions for additional information.
Depreciation and Amortization
The following table presents the depreciation and amortization associated with each line for the periods ended December 31, 2017, 2016 and 2015 (in thousands):
 
December 31,
 
2017
 
2016
 
2015
Cost of revenues
 
 
 
 
 
 
Services
 
$
102,212

 
$
101,260

 
$
95,825

Products
 
4,971

 
4,254

 
4,233

General and administrative expenses
 
14,919

 
8,701

 
8,904

Total
 
$
122,102

 
$
114,215

 
$
108,962