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Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets, Other than Goodwill | Our intangible assets, other than goodwill, as of March 31, 2018 and December 31, 2017 were as follows (in thousands, except for weighted average remaining useful life):
|  | Weighted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Average |  |  | As of March 31, 2018 |  |  | As of December 31, 2017 |
|  | Remaining |  |  | Gross |  |  |  |  |  | Net |  |  | Gross |  |  |  |  |  | Net |
|  | Useful Life |  |  | Carrying |  |  | Accumulated |  |  | Carrying |  |  | Carrying |  |  | Accumulated |  |  | Carrying |
|  | (in years) |  |  | Amount |  |  | Amortization |  |  | Amount |  |  | Amount |  |  | Amortization |  |  | Amount |
Amortized intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Software |  |  | 2.1 |  |  | $ | 148,172 |  |  | $ | (98,916 | ) |  | $ | 49,256 |  |  | $ | 145,063 |  |  | $ | (93,523 | ) |  | $ | 51,540 |
Service customer relationship |  |  | 2.0 |  |  |  | 8,081 |  |  |  | (6,042 | ) |  |  | 2,039 |  |  |  | 8,081 |  |  |  | (5,788 | ) |  |  | 2,293 |
Other intangible assets |  |  | 1.4 |  |  |  | 1,500 |  |  |  | (1,200 | ) |  |  | 300 |  |  |  | 1,500 |  |  |  | (1,103 | ) |  |  | 397 |
OEM and dealer relationships |  |  |  |  |  |  | 6,724 |  |  |  | (6,724 | ) |  |  | — |  |  |  | 6,724 |  |  |  | (6,724 | ) |  |  | — |
Total amortized intangible assets |  |  |  |  |  |  | 164,477 |  |  |  | (112,882 | ) |  |  | 51,595 |  |  |  | 161,368 |  |  |  | (107,138 | ) |  |  | 54,230 |
Unamortized intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FCC Licenses |  |  |  |  |  |  | 32,283 |  |  |  | — |  |  |  | 32,283 |  |  |  | 32,283 |  |  |  | — |  |  |  | 32,283 |
Total intangible assets |  |  |  |  |  | $ | 196,760 |  |  | $ | (112,882 | ) |  | $ | 83,878 |  |  | $ | 193,651 |  |  | $ | (107,138 | ) |  | $ | 86,513 |
Summary of Amortization Expenses | Amortization expense for each of the next five years and thereafter is estimated to be as follows (in thousands):
|  | Amortization |
Years ending December 31, |  | Expense |
2018 (period from April 1 to December 31) |  | $ | 19,725 |
2019 |  | $ | 17,093 |
2020 |  | $ | 9,236 |
2021 |  | $ | 3,337 |
2022 |  | $ | 1,706 |
Thereafter |  | $ | 498 |

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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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