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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Receivables allowance | $ 506 | $ 2,273
Accrued rental income allowance | 1,842 | 1,842
Debt costs accumulated amortization | $ 14,846 | $ 14,118
Preferred stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Preferred stock, shares authorized (in shares) | 15,000,000 | 15,000,000
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares authorized (in shares) | 375,000,000 | 375,000,000
Common stock, shares issued (in shares) | 163,513,474 | 161,503,585
Common stock, shares outstanding (in shares) | 163,513,474 | 161,503,585
Series E Preferred Stock |  |
Dividend rate | 5.70% | 5.70%
Preferred stock, depository shares issued (in shares) | 115,000 | 115,000
Preferred stock, depository shares outstanding (in shares) | 115,000 | 115,000
Preferred stock, stated liquidation value per share (in dollars per share) | $ 2,500 | $ 2,500
Series F Preferred Stock |  |
Dividend rate | 5.20% | 5.20%
Preferred stock, depository shares issued (in shares) | 138,000 | 138,000
Preferred stock, depository shares outstanding (in shares) | 138,000 | 138,000
Preferred stock, stated liquidation value per share (in dollars per share) | $ 2,500 | $ 2,500

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- Definition The valuation allowance as of the balance sheet date to reduce the gross amount of receivables to estimated net realizable value, which would be presented in parentheses on the face of the balance sheet. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 + Details
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