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Property and Equipment | 12 Months Ended
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Dec. 31, 2017
Property Plant And Equipment [Abstract] |
Property and Equipment | 4. Property and Equipment Property and equipment, net consists of the following:
|  | December 31, 2017 |  |  | December 31, 2016 |
|  | (In thousands) |
Land |  | $ | 370,828 |  |  | $ | 306,457 |
Building and improvements |  |  | 893,768 |  |  |  | 777,766 |
Software and computer equipment |  |  | 147,812 |  |  |  | 128,366 |
Parts and service equipment |  |  | 105,123 |  |  |  | 93,901 |
Office equipment and fixtures |  |  | 96,066 |  |  |  | 86,216 |
Company vehicles |  |  | 9,723 |  |  |  | 9,107 |
Construction in progress |  |  | 54,429 |  |  |  | 62,982 |
Total, at cost |  |  | 1,677,749 |  |  |  | 1,464,795 |
Less accumulated depreciation |  |  | (527,379 | ) |  |  | (450,184 | )
Subtotal |  |  | 1,150,370 |  |  |  | 1,014,611 |
Less assets held for sale (1) |  |  | (3,489 | ) |  |  | (4,231 | )
Property and equipment, net |  | $ | 1,146,881 |  |  | $ | 1,010,380 |
(1) | Classified in other current assets in the accompanying consolidated balance sheets.
Interest capitalized in conjunction with construction projects and software development was approximately $2.2 million, $2.8 million and $1.9 million for 2017, 2016 and 2015, respectively. As of December 31, 2017, commitments for facility construction projects totaled approximately $31.9 million. During 2017, 2016 and 2015, property and equipment impairment charges were recorded as noted in the following table:
Year Ended December 31, |  | (In thousands) |
2017 |  | $ | 4,894 |
2016 |  | $ | 8,063 |
2015 |  | $ | 12,210 |
Impairment charges were due to the abandonment of construction and software development projects, the abandonment and disposal of dealership equipment or Sonic’s estimate that based on historical and projected operating losses for certain dealerships, these dealerships would not be able to recover recorded property and equipment asset balances.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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