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Summary of Significant Accounting Policies Summary of Unearned Income (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Contract Liabilities |  |
Revenue Recognized | $ (7,548) | $ (445)
Franco-Nevada |  |
Contract Liabilities |  |
Opening Balance | 11,061 | 12,918
Revenue Recognized | 556 | 445
Closing Balance | 10,505 | 12,473
Kensington |  |
Contract Liabilities |  |
Opening Balance | 15,010 | 0
Revenue Recognized | 6,992 | 0
Closing Balance | $ 8,018 | $ 0

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
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