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Goodwill, Customer Relationships and Trademarks (Tables) | 12 Months Ended
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Dec. 31, 2016
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):
| December 31, 2016 |  | December 31, 2015
Goodwill | $ | 79,147 |  |  | $ | 18,379 |
Customer Relationships— Acquired (1) |  |  |
Cost | 63,571 |  |  | 14,883 |
Accumulated amortization | (31,660 | ) |  | (4,503 | )
Customer Relationships—Acquired, net | $ | 31,911 |  |  | $ | 10,380 |
Customer Relationships— Other (2) |  |  |
Cost | 4,320 |  |  | 4,320 |
Accumulated amortization | (2,708 | ) |  | (1,271 | )
Customer Relationships—Other, net | $ | 1,612 |  |  | $ | 3,049 |
Trademarks (3) |  |  |
Cost | 6,770 |  |  | 1,268 |
Accumulated amortization | (431 | ) |  | (74 | )
Trademarks, net | $ | 6,339 |  |  | $ | 1,194 |
(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. See Note 15 "Customer Acquisitions" for further discussion.
(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 consolidated balance sheets. See Note 3 "Acquisitions" for further discussion.
Changes in goodwill, customer relationships and trademarks consisted of the following (in thousands):
| Goodwill |  | Customer Relationships— Acquired & Non-Compete Agreements |  | Customer Relationships— Other |  | Trademarks
Balance at December 31, 2013 | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Additions | — |  |  | — |  |  | 1,589 |  |  | — |
Amortization expense | — |  |  | — |  |  | (88 | ) |  | — |
Balance at December 31, 2014 | $ | — |  |  | $ | — |  |  | $ | 1,501 |  |  | $ | — |
Additions | $ | — |  |  | $ | — |  |  | $ | 2,731 |  |  | $ | — |
Acquisition of CenStar | 6,396 |  |  | 5,494 |  |  | — |  |  | 651 |
Acquisition of Oasis | 11,983 |  |  | 9,389 |  |  | — |  |  | 617 |
Amortization expense | — |  |  | (4,503 | ) |  | (1,183 | ) |  | (74 | )
Balance at December 31, 2015 | $ | 18,379 |  |  | $ | 10,380 |  |  | $ | 3,049 |  |  | $ | 1,194 |
Additions | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Acquisition of Provider Companies | 26,040 |  |  | 24,417 |  |  | — |  |  | 529 |
Acquisition of Major Energy Companies | 34,728 |  |  | 24,271 |  |  | — |  |  | 4,973 |
Amortization expense | — |  |  | (27,157 | ) |  | (1,437 | ) |  | (357 | )
Balance at December 31, 2016 | $ | 79,147 |  |  | $ | 31,911 |  |  | $ | 1,612 |  |  | $ | 6,339 |
Estimated Future Amortization Expense of Intangible Assets | Estimated future amortization expense for customer relationships and trademarks at December 31, 2016 is as follows (in thousands):
Year Ending December 31, |
2017 | $ | 12,913 |
2018 | 10,337 |
2019 | 5,892 |
2020 | 2,894 |
2021 | 2,592 |
> 5 years | 5,234 |
Total | $ | 39,862 |

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