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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
The following is a summary of property, plant and equipment at December 31, 2016 and 2015 (in thousands):
 
Estimated
 
 
 
 
 
Useful Lives
 
December 31,
 
in Years
 
2016
 
2015
 
 
 
 
 
 
Land
—
 
$
15,730

 
$
10,119

Land improvements
8-15
 
9,379

 
9,289

Buildings and improvements
39
 
73,211

 
74,152

Rental machinery and equipment
7
 
933,667

 
898,134

Machinery and equipment - other
7
 
60,182

 
60,250

Furniture, fixtures and computers
5
 
19,073

 
18,240

Automobiles and other vehicles
5
 
36,796

 
48,402

Aircraft
7
 
16,267

 
16,267

Leasehold improvements
7-15, or lease term if shorter
 
8,027

 
7,947

Construction in progress - machinery
 
 
 
 
 
and equipment and buildings
—
 
120,937

 
102,432

 
 
 
1,293,269

 
1,245,232

Less: Accumulated depreciation
 
 
(726,245
)
 
(620,273
)
Total property, plant and equipment, net
 
 
$
567,024

 
$
624,959