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Inventory (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventory, net of reserves

Inventory consisted of the following (in thousands):

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​

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September 30, 2020

    

December 31, 2019

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Parts and supplies

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$

58,906

​

$

66,121

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Work in progress

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6,405

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8,346

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Inventory

​

$

65,311

​

$

74,467

​