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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Note 9—Goodwill and Intangible Assets During the year s ended December 31, 2016 and 2015, the change in the carrying amount of goodwill was as follows (in thousands):
Balance at January 1, 2015 | $ | 20,786 |
Acquisition of Mid Pac (1) | 27,531 |
Impairment expense | (6,990 | )
Balance at December 31, 2015 | 41,327 |
Acquisition of Wyoming Refining (1) | 64,994 |
Mid Pac acquisition purchase price allocation adjustment (2) | (589 | )
Balance at December 31, 2016 | $ | 105,732 |
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(1) | Please read Note 4—Acquisitions for further discussion.
(2) | During 2016, the purchase price allocation was adjusted to record an increase to tax receivables and a decrease to goodwill of $0.6 million. The tax receivable was recorded in connection with a tax refund received by Mid Pac in the first quarter of 2016.
At September 30, 2015, we conducted an interim goodwill impairment test of our Texadian reporting unit due to (i) a reduction in the forecasted results of operations during our annual budgeting process; (ii) the decision to cancel the charter on the barges used to move crude oil from Canada to the U.S. Gulf Coast due to lower forecasted commodity prices and (iii) negative cash flows from the business during 2015. Upon completion of the goodwill impairment test, we determined the goodwill associated with the Texadian reporting unit was fully impaired resulting in a charge of $7.0 million in our consolidated statement of operations for the year ended December 31, 2015. In assessing the value of the reporting unit, we primarily used an income approach with a weighted-average discount rate of 15%. There was no impairment of goodwill for the year ended December 31, 2016. Intangible assets consist of the following (in thousands):
| December 31,
| 2016 |  | 2015
Intangible assets: |  |  |  |  |
Railcar leases | $ | 3,249 |  |  | $ | 3,249 |
Trade names and trademarks | 6,267 |  |  | 6,267 |
Customer relationships | 32,064 |  |  | 32,064 |
Total intangible assets | 41,580 |  |  | 41,580 |
Accumulated amortization: |  |  |  |  |
Railcar leases | (2,599 | ) |  | (1,950 | )
Trade name and trademarks | (4,864 | ) |  | (3,540 | )
Customer relationships | (4,205 | ) |  | (1,722 | )
Total accumulated amortization | (11,668 | ) |  | (7,212 | )
Net: |  |  |  |  |
Railcar leases | 650 |  |  | 1,299 |
Trade name and trademarks | 1,403 |  |  | 2,727 |
Customer relationships | 27,859 |  |  | 30,342 |
Total intangible assets, net | $ | 29,912 |  |  | $ | 34,368 |
At September 30, 2015, we conducted an impairment test related to the intangible assets in our Texadian reporting unit. As of result of canceling the charter on the barges used to transport crude from Canada to the U.S. Gulf Coast in the Texadian business, we concluded that the supplier relationships intangible asset was fully impaired and recognized an impairment charge of $2.6 million in our consolidated statement of operations for the year ended December 31, 2015. Amortization expense was approximately $4.5 million, $4.4 million and $3.7 million for the years ended December 31, 2016, 2015 and 2014, respectively. Our intangible assets related to customer relationships and trade names have an average useful life of 13.6 years. Expected amortization expense for each of the next five years and thereafter is as follows (in thousands):
Year Ended |  | Amount
2017 |  | $ | 3,307 |
2018 |  | 2,658 |
2019 |  | 2,658 |
2020 |  | 2,658 |
2021 |  | 2,658 |
Thereafter |  | 15,973 |
|  | $ | 29,912 |

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