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Goodwill and Intangible Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the Carrying Amount of Goodwill | Changes in the carrying amount of goodwill were as follows:
(In thousands) |
Balance at December 31, 2016 | $ | 43,052 |
Goodwill acquired during the period (1) | 5,494 |
Foreign exchange effects | 105 |
Balance at December 31, 2017 | 48,651 |
Foreign exchange effects | (166 | )
Balance at December 31, 2018 | $ | 48,485 |
(1) | During 2017, we recognized $5.5 million of goodwill related to the Residential Control Systems, Inc. acquisition. Refer to Note 22 for further information about this acquisition.
Components of Intangible Assets | The components of intangible assets, net were as follows:
| December 31,
| 2018 |  | 2017
(In thousands) | Gross (1) |  | Accumulated Amortization (1) |  | Net (1) |  | Gross (1) |  | Accumulated Amortization (1) |  | Net (1)
Distribution rights (10 years) | $ | 329 |  |  | $ | (188 | ) |  | $ | 141 |  |  | $ | 344 |  |  | $ | (165 | ) |  | $ | 179 |
Patents (10 years) | 14,560 |  |  | (5,704 | ) |  | 8,856 |  |  | 13,250 |  |  | (5,310 | ) |  | 7,940 |
Trademarks and trade names (10 years) | 2,786 |  |  | (1,900 | ) |  | 886 |  |  | 2,786 |  |  | (1,594 | ) |  | 1,192 |
Developed and core technology (5-15 years) | 12,560 |  |  | (8,087 | ) |  | 4,473 |  |  | 12,560 |  |  | (6,071 | ) |  | 6,489 |
Capitalized software development costs (2 years) | 155 |  |  | — |  |  | 155 |  |  | 142 |  |  | (77 | ) |  | 65 |
Customer relationships (10-15 years) | 32,534 |  |  | (22,675 | ) |  | 9,859 |  |  | 32,534 |  |  | (19,395 | ) |  | 13,139 |
Order backlog (1 year) | — |  |  | — |  |  | — |  |  | 150 |  |  | (113 | ) |  | 37 |
Total intangible assets, net | $ | 62,924 |  |  | $ | (38,554 | ) |  | $ | 24,370 |  |  | $ | 61,766 |  |  | $ | (32,725 | ) |  | $ | 29,041 |
(1) | This table excludes the gross value of fully amortized intangible assets totaling $7.1 million and $6.0 million on December 31, 2018 and 2017, respectively.
Amortization Expense by Income Statement Caption | Amortization expense by statement of operations caption was as follows:
| Year Ended December 31,
(In thousands) | 2018 |  | 2017 |  | 2016
Cost of sales | $ | 103 |  |  | $ | 184 |  |  | $ | 76 |
Selling, general and administrative expenses | 7,081 |  |  | 6,772 |  |  | 6,198 |
Total amortization expense | $ | 7,184 |  |  | $ | 6,956 |  |  | $ | 6,274 |
Estimated Future Amortization Expense Related to Intangible Assets | Estimated future annual amortization expense related to our intangible assets at December 31, 2018, is as follows:
(In thousands) |
2019 | $ | 7,102 |
2020 | 5,938 |
2021 | 2,372 |
2022 | 2,259 |
2023 | 2,110 |
Thereafter | 4,589 |
Total | $ | 24,370 |

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