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Summary of Significant Accounting Policies Summary of Unearned Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Contract Liabilities |  |  |  |
Revenue Recognized | $ (8,134) | $ 0 | $ (15,682) | $ 0
Franco-Nevada |  |  |  |
Contract Liabilities |  |  |  |
Opening Balance | 10,505 | 12,473 | 11,061 | 12,918
Revenue Recognized | 116 | 313 | 672 | 758
Closing Balance | 10,389 | 12,160 | 10,389 | 12,160
Kensington |  |  |  |
Contract Liabilities |  |  |  |
Opening Balance | 8,018 | 0 | 15,010 | 0
Revenue Recognized | 8,018 | 0 | 15,010 | 0
Closing Balance | 15,006 | 25,021 | 15,006 | 25,021
Deferred Revenue, Additions | $ 15,006 | $ 25,021 | $ 15,006 | $ 25,021

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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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