Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the years ended December 31, 2016 and 2015, were as follows (in thousands): | | | | | | | Balance as of January 1, 2015 | $ | 841,522 |
| Goodwill Impaired due to Wireless Restructuring (see Note 3) | (2,270 | ) | Effect of Foreign Currency Translation | (4,836 | ) | Balance as of December 31, 2015 | 834,416 |
| Effect of Foreign Currency Translation | 817 |
| Balance as of December 31, 2016 | $ | 835,233 |
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Schedule of Intangible Asset Balances | The following table presents intangible asset balances as of December 31, 2016 and 2015 (in thousands):
| | | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2016 | | December 31, 2015 | | | | Gross Carrying Amount | | Accumulated Amortization | | Net Carrying Amount | | Gross Carrying Amount | | Accumulated Amortization | | Net Carrying Amount | | Estimated Useful Lives | Definite-lived intangible assets: | | | | | | | | | | | | | | Customer contracts | $ | 965,179 |
| | $ | (539,910 | ) | | $ | 425,269 |
| | $ | 962,842 |
| | $ | (430,803 | ) | | $ | 532,039 |
| | 10 years | 2GIG 2.0 technology | 17,000 |
| | (10,479 | ) | | 6,521 |
| | 17,000 |
| | (7,064 | ) | | 9,936 |
| | 8 years | Other technology | 7,067 |
| | (4,984 | ) | | 2,083 |
| | 7,067 |
| | (3,438 | ) | | 3,629 |
| | 5 - 7 years | Space Monkey technology | 7,100 |
| | (2,268 | ) | | 4,832 |
| | 7,100 |
| | (761 | ) | | 6,339 |
| | 6 years | Patents | 8,724 |
| | (3,913 | ) | | 4,811 |
| | 7,524 |
| | (2,094 | ) | | 5,430 |
| | 5 years | Non-compete agreements | 1,200 |
| | (1,200 | ) | | — |
| | 1,200 |
| | (800 | ) | | 400 |
| | 2 - 3 years | Total definite-lived intangible assets: | 1,006,270 |
| | (562,754 | ) | | 443,516 |
| | 1,002,733 |
| | (444,960 | ) | | 557,773 |
| | | | | | | | | | | | | | | | | Indefinite-lived intangible assets: | | | | | | | | | | | | | | Spectrum licenses | 31,253 |
| | — |
| | 31,253 |
| | — |
| | — |
| | — |
| | | IP addresses | 564 |
| | — |
| | 564 |
| | 564 |
| | — |
| | 564 |
| | | Domain names | 59 |
| | — |
| | 59 |
| | 58 |
| | — |
| | 58 |
| | | Total Indefinite-lived intangible assets | 31,876 |
| | — |
| | 31,876 |
| | 622 |
| | — |
| | 622 |
| | | Total intangible assets, net | $ | 1,038,146 |
| | $ | (562,754 | ) | | $ | 475,392 |
| | $ | 1,003,355 |
|
| $ | (444,960 | ) | | $ | 558,395 |
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Schedule of Estimated Future Amortization Expense of Intangible Assets Excluding Patents Currently in Process | Estimated future amortization expense of intangible assets, excluding approximately $0.3 million in patents currently in process, is as follows as of December 31, 2016 (in thousands): | | | | | | | 2017 | $ | 101,296 |
| 2018 | 89,736 |
| 2019 | 78,082 |
| 2020 | 67,288 |
| 2021 | 58,288 |
| Thereafter | 48,548 |
| Total estimated amortization expense | $ | 443,238 |
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