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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Accounts receivable allowance | $ 1,166 | $ 753
Mortgages and notes receivable allowance | 44 | 72
Accrued straight-line rents receivable allowance | 641 | 819
Deferred leasing costs, accumulated amortization | 149,275 | 143,512
Prepaid expenses and other assets, accumulated amortization | $ 18,074 | $ 19,092
Equity/Capital: |  |
Preferred Stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Preferred Stock, authorized shares (in shares) | 50,000,000 | 50,000,000
Preferred Stock, liquidation preference (in dollars per share) | $ 1,000 | $ 1,000
Preferred Stock, shares issued (in shares) | 28,877 | 28,892
Preferred Stock, shares outstanding (in shares) | 28,877 | 28,892
Common Stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common Stock, authorized shares (in shares) | 200,000,000 | 200,000,000
Common Stock, shares issued (in shares) | 103,557,065 | 103,266,875
Common Stock, shares outstanding (in shares) | 103,557,065 | 103,266,875
Highwoods Realty Limited Partnership [Member] |  |
Assets: |  |
Accounts receivable allowance | $ 1,166 | $ 753
Mortgages and notes receivable allowance | 44 | 72
Accrued straight-line rents receivable allowance | 641 | 819
Deferred leasing costs, accumulated amortization | 149,275 | 143,512
Prepaid expenses and other assets, accumulated amortization | $ 18,074 | $ 19,092
Redeemable Operating Partnership Units: |  |
Redeemable Common Units, outstanding (in shares) | 2,738,703 | 2,828,704
Preferred Units liquidation preference (in dollars per share) | $ 1,000 | $ 1,000
Series A Preferred Units, issued (in shares) | 28,877 | 28,892
Series A Preferred Units, outstanding (in shares) | 28,877 | 28,892
Common Units: |  |
General partners' capital account, units outstanding (in shares) | 1,058,870 | 1,056,868
Limited partners' capital account, units outstanding (in shares) | 102,089,386 | 101,801,198

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