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Goodwill and other intangibles (Tables) | 12 Months Ended
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Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of the Activity in the Companys Goodwill | The activity in the Company’s goodwill as of December 31 was as follows:
|  | 2015 |  |  | 2014 |
Balance at beginning of year |  | $ | 23,546 |  |  | $ | — |
Acquisitions |  |  | 17,920 |  |  |  | 23,546 |
Balance at end of year |  | $ | 41,466 |  |  | $ | 23,546 |
Summary of the Amortization Expense | Amortization expense was classified as follows in the Company’s consolidated statements of operations for the years ended December 31:
|  | 2015 |  |  | 2014 |  |  | 2013 |
Cost of sales |  | $ | 742 |  |  | $ | 1,134 |  |  | $ | 40 |
Operating expenses |  |  | 4,582 |  |  |  | 1,013 |  |  |  | — |
|  | $ | 5,324 |  |  | $ | 2,147 |  |  | $ | 40 |
Schedule of Other Intangible Assets | The tables below shows the amortization period and intangible asset cost by intangible asset as of December 31, 2015 and December 31, 2014 and the accumulated amortization and net intangible asset value in total for all those intangible assets that related to the Company’s acquisitions, for the related period. Refer to Note 3, “Acquisitions” for a further discussion of these acquisitions.
|  |  |  |  | 2015 |
Description of intangible |  | Amortization period |  |  | Gross amount |  |  | Accumulated amortization |  |  | Net amount |
Backlog |  |  | 18 months |  |  | $ | 1,800 |  |  | $ | (1,800 | ) |  | $ | — |
Customer relationships |  |  | 13 years |  |  |  | 34,940 |  |  |  | (5,129 | ) |  |  | 29,811 |
Developed technology |  |  | 7 years |  |  |  | 700 |  |  |  | (113 | ) |  |  | 587 |
Trade names and trademarks |  |  | 13 years |  |  |  | 1,700 |  |  |  | (353 | ) |  |  | 1,347 |
Total |  |  |  |  |  | $ | 39,140 |  |  | $ | (7,395 | ) |  | $ | 31,745 |
|  |  |  |  | 2014 |
Description of intangible |  | Amortization period |  |  | Gross amount |  |  | Accumulated amortization |  |  | Net amount |
Backlog |  |  | 18 months |  |  | $ | 1,200 |  |  | $ | (1,095 | ) |  | $ | 105 |
Customer relationships |  |  | 13 years |  |  |  | 20,600 |  |  |  | (926 | ) |  |  | 19,674 |
Trade names and trademarks |  |  | 13 years |  |  |  | 1,700 |  |  |  | (87 | ) |  |  | 1,613 |
Total |  |  |  |  |  | $ | 23,500 |  |  | $ | (2,108 | ) |  | $ | 21,392 |
Schedule of Estimated Future Amortization Expense for Intangible Assets | The table below shows the estimated future amortization expense for intangible assets:
Year |  | Estimated amortization expense |
2016 |  | $ | 5,714 |
2017 |  |  | 4,837 |
2018 |  |  | 4,182 |
2019 |  |  | 3,638 |
2020 |  |  | 3,053 |
Thereafter |  |  | 10,321 |
Total |  | $ | 31,745 |

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