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Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 30, 2020
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment The following is a summary of property, plant and equipment at June 30, 2020 and December 31, 2019 (in thousands):
Estimated
Useful Lives
in Years		June 30,
2020		December 31,
2019
Land—$29,744  $30,724  
Land improvements
8-15
7,169  7,193  
Buildings and improvements
13-39
114,314  116,182  
Rental machinery and equipment
5-7
883,108  882,979  
Machinery and equipment - other
7
56,992  60,182  
Furniture, fixtures and computers
5
16,988  17,251  
Automobiles and other vehicles
5
28,044  28,734  
Leasehold improvements
7-15, or lease term if shorter
13,408  14,258  
Construction in progress - machinery and equipment—44,106  46,564  
1,193,873  1,204,067  
Less: Accumulated depreciation(896,079) (875,635) 
Total property, plant and equipment, net$297,794  $328,432  
Summary of Depreciation and Amortization Expense The following table presents the depreciation and amortization expense associated with each line item for the three and six months ended June 30, 2020 and 2019 (in thousands):
Three Months EndedSix Months Ended
June 30,June 30,
2020201920202019
Services$15,771  $20,907  $33,034  $42,412  
Products184  425  423  859  
General and administrative expenses1,297  2,581  3,513  5,884  
Total$17,252  $23,913  $36,970  $49,155