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Inventory

12 Months Ended

Dec. 31, 2020

Inventory Disclosure [Abstract]

Inventory

6. Inventory

Inventory consisted of the following (in thousands):

​

​	​	​	​	​	​	​
​	​	December 31,
​	​	2020			2019
Parts and supplies	​	$	57,433	​	$	66,121
Work in progress	​		6,237	​		8,346
Inventory	​	$	63,670	​	$	74,467

​

During the years ended December 31, 2020, 2019 and 2018, we recorded write-downs to inventory of $1.3 million, $0.9 million and $1.6 million, respectively, for inventory considered to be excess, obsolete or carried at an amount in excess of net realizable value.

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- References

No definition available.

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- Definition

The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-URI http://asc.fasb.org/topic&trid=2126998

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