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Intangible Assets and Goodwill | 12 Months Ended
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Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets and Goodwill | 5. Intangible Assets and Goodwill The changes in the carrying amount of franchise assets and goodwill for 2017 and 2016 were as follows:
|  | Franchise Assets |  |  | Net Goodwill |  |
|  | (In thousands) |  |
Balance at December 31, 2015 |  | $ | 74,900 |  |  | $ | 471,493 |  | (1)
Prior year acquisition allocations |  |  | - |  |  |  | 944 |  |
Balance at December 31, 2016 |  | $ | 74,900 |  |  | $ | 472,437 |  | (1)
Additions through current year acquisitions |  |  | - |  |  |  | 60,024 |  |
Reductions from dispositions |  |  | (1,400 | ) |  |  | (5,737 | ) |
Reductions from impairment |  |  | (3,600 | ) |  |  | (900 | ) |
Prior year acquisition allocations |  |  | - |  |  |  | (44 | ) |
Balance at December 31, 2017 |  | $ | 69,900 |  |  | $ | 525,780 |  | (2)
(1) | Net of accumulated impairment losses of $796,725.
(2) | Net of accumulated impairment losses of $797,625.
Goodwill Sonic impaired approximately $0.9 million of goodwill in 2017 related to the write-off of goodwill due to the closure of two stand-alone pre-owned vehicle stores that were acquired in 2016. There was no impairment of goodwill in 2016. Other Intangible Assets Other intangible assets consists of franchise assets and definite life intangible assets, and is presented net of accumulated amortization on the accompanying consolidated balance sheets. Pursuant to applicable accounting pronouncements, Sonic evaluates its franchise assets and definite life intangible assets for impairment annually (as of October 1) or more frequently if an event occurs or circumstances change that would more likely than not reduce the fair value of the asset below its carrying amount. Franchise asset impairment charges of $3.6 million and $3.3 million for 2017 and 2015, respectively, were recorded in continuing operations based on the impairment evaluations performed. There were no franchise asset impairment charges in 2016, and no definite life intangible asset impairment charges in 2017, 2016 and 2015. Definite life intangible assets consist of the following:
|  | December 31, 2017 |  |  | December 31, 2016 |
|  | (In thousands) |
Favorable lease agreements |  | $ | 17,317 |  |  | $ | 17,318 |
Less accumulated amortization |  |  | (12,628 | ) |  |  | (11,985 | )
Definite life intangibles, net |  | $ | 4,689 |  |  | $ | 5,333 |
Amortization expense for definite life intangible assets was approximately $0.6 million in each of 2017, 2016 and 2015. The initial weighted average amortization period for lease agreements and definite life intangible assets outstanding at December 31, 2017 was 17 years. Expiration dates for these lease agreements range between 2020 and 2027. Future amortization expense is as follows:
Year Ending December 31, |  | (In thousands) |
2018 |  | $ | 644 |
2019 |  |  | 644 |
2020 |  |  | 614 |
2021 |  |  | 475 |
2022 |  |  | 408 |
Thereafter |  |  | 1,904 |
Total |  | $ | 4,689 |

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- Definition The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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