Table:
| Year Ended December 31, |  |  |
| --- | --- | --- |
|  | 2019 | 2018 |
| Beginning of period balance | $11,176 | $12,678 |
| Revenue deferred and acquired in current period | 6,127 | 3,954 |
| Revenue recognized from amounts included in contract liabilities | (6,805) | (5,456) |
| End of period balance | $10,498 | $11,176 |
Paragraphs:
Contract Liabilities
Contract liabilities include payments received in advance of performance under the contract, and are realized with the associated revenue recognized under the contract. The changes in our contract liabilities are as follows (in thousands):
The revenue recognized from amounts included in contract liabilities primarily relates to prepayment contracts with customers as well as payments of activation fees.
Question:
Which years does the table provide information for the changes in the company's contract liabilities?
Answer: 2019, 2018