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Summary of Significant Accounting Policies - Contract Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Outstanding Chip Liability |  |
Movement in Contract with Customer, Liability [Roll Forward] |  |
Balance at January 1 | $ 756 | $ 1,763
Balance at December 31 | 997 | 756
Increase (decrease) | 241 | (1,007)
Loyalty Program |  |
Movement in Contract with Customer, Liability [Roll Forward] |  |
Balance at January 1 | 4,696 | 6,214
Balance at December 31 | 3,969 | 4,696
Increase (decrease) | (727) | (1,518)
Customer Deposits and Other |  |
Movement in Contract with Customer, Liability [Roll Forward] |  |
Balance at January 1 | 5,015 | 6,126
Balance at December 31 | 3,497 | 5,015
Increase (decrease) | $ (1,518) | $ (1,111)

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 + Details
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