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PROPERTY PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2022
PROPERTY PLANT AND EQUIPMENT [ABSTRACT] |
PROPERTY, PLANT AND EQUIPMENT | (5)PROPERTY, PLANT AND EQUIPMENT ​ Property, plant and equipment consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2022 |  | 2021 |
Land and buildings | ​ | $ | 32,070 | ​ | $ | 32,942 | ​
Computer equipment and software | ​ |  | 527,096 | ​ |  | 503,056 | ​
Telephone equipment | ​ |  | 46,235 | ​ |  | 50,256 | ​
Furniture and fixtures | ​ |  | 80,843 | ​ |  | 84,944 | ​
Leasehold improvements | ​ |  | 171,141 | ​ |  | 189,161 | ​
Motor vehicles | ​ |  | 258 | ​ |  | 257 | ​
Property, plant and equipment, gross | ​ |  | 857,643 | ​ |  | 860,616 | ​
Less: Accumulated depreciation and amortization | ​ |  | (674,283) | ​ |  | (692,212) | ​
Property, plant and equipment, net | ​ | $ | 183,360 | ​ | $ | 168,404 | ​
​ Depreciation and amortization expense for property, plant and equipment was $64.5 million, $63.5 million and $62.7 million for the years ended December 31, 2022, 2021 and 2020, respectively. Included in the computer equipment and software is internally developed software of $26.8 million net and $19.4 million net as of December 31, 2022 and 2021, respectively. During 2022 and 2021, impairments of internally developed software of $6.0 million and $3.2 million, respectively, were expensed and included in Impairment losses in the Consolidated Statements of Comprehensive Income (Loss).

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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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://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 https://asc.fasb.org/extlink&oid=126982197&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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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