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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment |
Property, Plant and Equipment | ​ Note 8 Property, Plant and Equipment ​ The major components of our property, plant and equipment are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2021 |  | 2020 |
​ | ​ | (In thousands) |
Land | ​ | $ | 22,955 | ​ | $ | 28,261 | ​
Buildings | ​ |  | 130,917 | ​ |  | 141,365 | ​
Drilling rigs and related equipment | ​ |  | 11,702,450 | ​ |  | 12,487,961 | ​
Oilfield hauling and mobile equipment | ​ |  | 243,850 | ​ |  | 259,150 | ​
Other machinery and equipment | ​ |  | 200,740 | ​ |  | 195,903 | ​
​ | ​ | $ | 12,300,912 | ​ | $ | 13,112,640 | ​
Less: accumulated depreciation and amortization | ​ |  | (8,968,414) | ​ |  | (9,126,933) | ​
​ | ​ | $ | 3,332,498 | ​ | $ | 3,985,707 | ​
Depreciation expense included in depreciation and amortization expense in our consolidated statements of income (loss) totaled $689.2 million, $851.8 million and $869.6 million during 2021, 2020 and 2019, respectively. ​ Repair and maintenance expense included in direct costs in our consolidated statements of income (loss) totaled $153.9 million, $154.2 million and $248.6 million during 2021, 2020 and 2019, respectively. ​ Interest costs of $0.7 million, $0.7 million and $1.5 million were capitalized during 2021, 2020 and 2019, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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