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Property, Plant and Equipment
3 Months Ended
Mar. 31, 2017
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, 2017 and December 31, 2016 (in thousands):
 
Estimated
Useful Lives
in Years
 
March 31,
2017
 
December 31,
2016
Land
 
$
15,871

 
$
15,730

Land improvements
8-15
 
9,379

 
9,379

Buildings and improvements
39
 
71,719

 
73,211

Rental machinery and equipment
7
 
935,619

 
933,667

Machinery and equipment - other
7
 
59,298

 
60,182

Furniture, fixtures and computers
5
 
20,250

 
19,073

Automobiles and other vehicles
5
 
35,073

 
36,796

Aircraft
7
 

 
16,267

Leasehold improvements
7-15, or lease term if shorter
 
10,135

 
8,027

Construction in progress - machinery
     and equipment and buildings
 
128,819

 
120,937

 
 
 
1,286,163

 
1,293,269

Less: Accumulated depreciation
 
 
(737,604
)
 
(726,245
)
Total property, plant and equipment, net
 
 
$
548,559

 
$
567,024