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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
The following is a summary of property, plant and equipment at December 31, 2018 and 2017 (in thousands):
 
 
 
December 31,
 
Estimated Useful Lives in Years
 
2018
 
2017
 
 
 
 
 
 
Land (1)
—
 
$
32,945

 
$
15,314

Land improvements
8-15
 
8,316

 
14,594

Buildings and improvements (1)
13-39
 
125,088

 
119,380

Rental machinery and equipment
7
 
887,064

 
898,146

Machinery and equipment - other
7
 
61,796

 
55,049

Furniture, fixtures and computers
5
 
24,745

 
27,259

Automobiles and other vehicles
5
 
29,696

 
29,971

Leasehold improvements
7-15, or lease term if shorter
 
15,392

 
10,030

Construction in progress - machinery and equipment and buildings
—
 
65,152

 
61,836

 
 
 
1,250,194

 
1,231,579

Less: Accumulated depreciation
 
 
(833,704
)
 
(761,933
)
Total property, plant and equipment, net
 
 
$
416,490

 
$
469,646

 
 
(1) 
The balances as of December 31, 2018 include the acquisition of land and buildings of $18.5 million and $18.5 million, respectively. 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, 2018, 2017 and 2016 (in thousands):
 
December 31,
 
2018
 
2017
 
2016
Cost of revenues
 
 
 
 
 
 
Services
 
$
93,280

 
$
102,212

 
$
101,260

Products
 
4,354

 
4,971

 
4,254

General and administrative expenses
 
13,658

 
14,919

 
8,701

Total
 
$
111,292

 
$
122,102

 
$
114,215