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Inventories
 9 Months Ended
Sep. 30, 2025
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories are valued at the lower of cost or net realizable value. Cost is determined by the first-in, first-out (“FIFO”) method. We establish an allowance for excess and obsolete inventories based on product line changes, the feasibility of substituting parts and the need for supply and replacement parts.
The components of inventories and related changes in the allowance for excess and obsolete inventories account are as follows:
 September 30,
2025		December 31,
2024
 (in thousands)
Raw materials$255,744 $192,136 
Work in process13 20 
Finished goods971 456 
Total, gross
256,728 192,612 
Less:  Allowance for excess and obsolete inventories6,217 5,192 
Total, net
$250,511 $187,420 
  Three Months EndedNine Months Ended
 September 30,
2025		September 30,
2024		September 30,
2025		September 30,
2024
Allowance for excess and obsolete inventories:(in thousands)
Balance, beginning of period$5,480 $6,801 $5,192 $6,160 
Provision for excess and obsolete inventories785 2,075 1,417 4,003 
Inventories written off(48)(868)(392)(2,155)
Balance, end of period$6,217 $8,008 $6,217 $8,008