Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Tenant receivables allowance for doubtful accounts	$ 2,097	$ 2,011
Other receivables allowance for doubtful accounts	$ 838	$ 838
Preferred stock, par value (USD per share)	$ 0.01	$ 0.01
Preferred stock authorized (shares)	15,000,000	15,000,000
Common stock, par value (USD per share)	$ 0.01	$ 0.01
Common stock authorized (shares)	350,000,000	350,000,000
Common stock issued (shares)	172,661,708	171,088,778
Common stock outstanding (shares)	172,661,708	171,088,778
Series D Preferred Stock
Preferred stock outstanding (shares)	1,815,000	1,815,000
Dividend rate of preferred stock (as a percent)	7.375%	7.375%
Series E Preferred Stock
Preferred stock outstanding (shares)	690,000	690,000
Dividend rate of preferred stock (as a percent)	6.625%	6.625%
CBL & Associates Limited Partnership
Tenant receivables allowance for doubtful accounts	$ 2,097	$ 2,011
Other receivables allowance for doubtful accounts	838	$ 838
Assets related to consolidated variable interest entities	638,301
Liabilities related to consolidated variable interest entities	$ 351,039

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.

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