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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Parent Company [Member] |  |
Allowance for doubtful accounts receivable | $ 14,332 | $ 12,728
Deferred costs accumulated amortization | 98,829 | 93,291
Accumulated amortization of acquired lease intangible assets | 206,378 | 148,280
Accumulated accretion of acquired lease intangible liabilities | $ 84,435 | $ 56,550
Preferred stock, par value per share | $ 0.01 | $ 0.01
Preferred stock, shares authorized | 30,000,000 | 30,000,000
Common stock, par value per share | $ 0.01 | $ 0.01
Common stock, shares authorized | 220,000,000 | 220,000,000
Common stock, shares issued | 169,441,714 | 171,364,908
Exchangeable operating partnership units aggregate redemption value | $ 22,628 | $ 24,206
Treasury stock, shares held at cost | 385,652 | 366,628
Partnership Interest [Member] |  |
Allowance for doubtful accounts receivable | $ 14,332 | $ 12,728
Deferred costs accumulated amortization | 98,829 | 93,291
Accumulated amortization of acquired lease intangible assets | 206,378 | 148,280
Accumulated accretion of acquired lease intangible liabilities | $ 84,435 | $ 56,550
Preferred units of general partner par value per unit | $ 0.01 | $ 0.01
General partner units, outstanding | 169,441,714 | 171,364,908
Limited partner units, outstanding | 349,902 | 349,902

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