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Basis of Presentation and Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2020
Accounting Policies [Abstract] |
Schedule of Contract and Contract - Related Liabilities | The following table summarizes the activity related to contract and contract-related liabilities:
| Outstanding Chip Liability |  |  | Loyalty Program |  |  | Customer Advances and Other |
| 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
| (in thousands) |
Balance at January 1 | $ | 314,570 |  |  | $ | 323,811 |  |  | $ | 126,966 |  |  | $ | 113,293 |  |  | $ | 481,095 |  |  | $ | 667,285 |
Balance at June 30 |  | 338,390 |  |  |  | 322,259 |  |  |  | 131,641 |  |  |  | 120,978 |  |  |  | 306,752 |  |  |  | 588,559 |
Increase / (decrease) | $ | 23,820 |  |  | $ | (1,552 | ) |  | $ | 4,675 |  |  | $ | 7,685 |  |  | $ | (174,343 | ) |  | $ | (78,726 | )

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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