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FCC Licenses (Tables) | 12 Months Ended
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Dec. 31, 2019
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Carrying Amount of Broadcasting Licenses | Changes in the carrying amount of FCC licenses for the years ended December 31, 2018 and 2019 are as follows:
Balance as of January 1, 2018 |  | $ | 489,186,679 |
Acquisitions of translator licenses |  |  | 202,675 |
Business acquisition (see Note 3) |  |  | 27,346,200 |
Balance as of December 31, 2018 |  |  | 516,735,554 |
Asset acquisition (see Note 3) |  |  | 13,155,601 |
Impairment losses |  |  | (12,361,988 | )
Balance as of December 31, 2019 |  | $ | 517,529,167 |
Discounted Cash Flow Analyses | The key assumptions used in the discounted cash flow analyses are as follows:
Revenue growth rates |  | 0.5% - 1.4%
Market revenue shares at maturity |  | 0.6% - 1.1%
Operating income margins at maturity |  | 27.5% - 29.8%
Discount rate |  | 9.0%

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