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Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 30, 2023
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
Property, plant and equipment include the following (in thousands):
June 30,December 31,
Useful Life20232022
Pressure pumping equipment
3-5 years
$251,051 $230,760 
Drilling rigs and related equipment
3-15 years
110,818 110,724 
Machinery and equipment
7-20 years
159,801 162,634 
Buildings(a)
15-39 years
40,909 40,316 
Vehicles, trucks and trailers
5-10 years
101,201 101,580 
Coil tubing equipment
4-10 years
6,908 6,908 
LandN/A12,393 12,393 
Land improvements
15 years or life of lease
10,066 10,053 
Rail improvements
10-20 years
13,793 13,793 
Other property and equipment(b)
3-12 years
18,375 18,296 
725,315 707,457 
Deposits on equipment and equipment in process of assembly(c)
8,077 13,885 
733,392 721,342 
Less: accumulated depreciation(d)
606,202 583,276 
Total property, plant and equipment, net$127,190 $138,066 
a.    Included in Buildings at each of June 30, 2023 and December 31, 2022 are costs of $7.6 million related to assets under operating leases.
b.    Included in Other property and equipment at each of June 30, 2023 and December 31, 2022 are costs of $6.0 million related to assets under operating leases.
c.    Deposits on equipment and equipment in process of assembly represents deposits placed with vendors for equipment that is in the process of assembly and purchased equipment that is being outfitted for its intended use. The equipment is not yet placed in service.
d.    Includes accumulated depreciation of $8.7 million and $8.0 million at June 30, 2023 and December 31, 2022, respectively, related to assets under operating leases.
Schedule of Depreciation, Depletion, Accretion and Amortization Expense
A summary of depreciation, depletion, amortization and accretion expense is below (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2023202220232022
Depreciation expense$11,130 $16,759 $23,857 $33,685 
Amortization expense195 195 389 389 
Accretion and depletion expense1,325 522 1,360 569 
Depreciation, depletion, amortization and accretion$12,650 $17,476 $25,606 $34,643