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Goodwill, Customer Relationships and Trademarks (Tables) | 3 Months Ended
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Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill and Intangible Assets | Goodwill, customer relationships and trademarks consist of the following amounts as of (in thousands):
| March 31, 2017 | December 31, 2016
Goodwill | $ | 79,407 |  | $ | 79,147 |
Customer relationships - Acquired (1) |  |
Cost | $ | 63,571 |  | $ | 63,571 |
Accumulated amortization | (33,812 | ) | (31,660 | )
Customer relationships - Acquired, net | $ | 29,759 |  | $ | 31,911 |
Customer relationships - Other (2) |  |
Cost | $ | 4,320 |  | $ | 4,320 |
Accumulated amortization | (3,068 | ) | (2,708 | )
Customer relationships - Other, net | $ | 1,252 |  | $ | 1,612 |
Trademarks (3) |  |
Cost | $ | 6,770 |  | $ | 6,770 |
Accumulated amortization | (551 | ) | (431 | )
Trademarks, net | $ | 6,219 |  | $ | 6,339 |
(1) Customer relationships - Acquired represent those customer acquisitions accounted for under the acquisition method in accordance with ASC 805. See Note 3 "Acquisitions" for further discussion. (2) Customer relationships - Other represent portfolios of customer contracts not accounted for in accordance with ASC 805 as these acquisitions were not in conjunction with the acquisition of businesses. (3) Trademarks reflect values associated with the recognition and positive reputation of acquired businesses accounted for as part of the acquisition method in accordance with ASC 805 through the acquisitions of CenStar, Oasis, the Provider Companies and the Major Energy Companies. These trademarks are recorded as other assets in the condensed consolidated balance sheets. See Note 3 "Acquisitions" for further discussion. Changes in goodwill, customer relationships and trademarks consisted of the following (in thousands):
| Goodwill (1) | Customer Relationships - Acquired | Customer Relationships - Others | Trademarks
Balance at December 31, 2016 | $ | 79,147 |  | $ | 31,911 |  | $ | 1,612 |  | $ | 6,339 |
Additions (Major Working Capital Adjustment) | 260 |  | — |  | — |  | — |
Amortization expense | — |  | (2,152 | ) | (360 | ) | (120 | )
Balance at March 31, 2017 | $ | 79,407 |  | $ | 29,759 |  | $ | 1,252 |  | $ | 6,219 |
(1) Changes in goodwill in the three months ended March 31, 2017 related to NG&E's working capital settlement with the Major Energy Companies' sellers.
Estimated Future Amortization Expense of Intangible Assets | Estimated future amortization expense for customer relationships and trademarks at March 31, 2017 is as follows (in thousands):
Year ending December 31, |
2017 | $ | 10,281 |
2018 | 10,337 |
2019 | 5,892 |
2020 | 2,894 |
2021 | 2,592 |
> 5 years | 5,234 |
Total | $ | 37,230 |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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