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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Accumulated amortization of deferred leasing costs | $ 29,854 | $ 30,375
Common Shares of beneficial interest, par value (in dollars per share) | $ 0.01 | $ 0.01
Common Shares of beneficial interest, shares authorized (in shares) | 150,000,000 | 150,000,000
Common Shares of beneficial interest issued (in shares) | 112,327,234 | 112,181,759
Common Shares of beneficial interest, shares outstanding (in shares) | 112,327,234 | 112,181,759
Investing Receivables |  |
Investing receivable allowance for credit loss | $ 2,080 | $ 2,851

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- Definition For an unclassified balance sheet, the accumulated amortization, as of the reporting date, which represents the periodic charge to earnings of initial direct costs which have been deferred and are being allocated over the lease term in proportion to the recognition of rental income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121598990&loc=d3e40879-112712 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=121585684&loc=d3e40588-112709 + Details
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