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Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 30, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
The following is a summary of property, plant and equipment at June 30, 2016 and December 31, 2015 (in thousands):
 
Estimated
Useful Lives
in Years
 
June 30,
2016
 
December 31,
2015
Land
—
 
$
14,176

 
$
10,119

Land improvements
8-15
 
9,378

 
9,289

Buildings and improvements
39
 
70,615

 
74,152

Rental machinery and equipment
7
 
906,542

 
898,134

Machinery and equipment - other
7
 
60,223

 
60,250

Furniture, fixtures and computers
5
 
18,272

 
18,240

Automobiles and other vehicles
5
 
43,896

 
48,402

Aircraft
7
 
16,267

 
16,267

Leasehold improvements
7-15, or lease term if shorter
 
8,314

 
7,947

Construction in progress - machinery
     and equipment and buildings
—
 
106,907

 
102,432

 
 
 
1,254,590

 
1,245,232

Less: Accumulated depreciation
 
 
(666,334
)
 
(620,273
)
Total property, plant and equipment, net
 
 
$
588,256

 
$
624,959