Tenant and Other Receivables, net:	9 Months Ended
Tenant and Other Receivables, net:	Sep. 30, 2015
Loans and Leases Receivable Disclosure [Abstract]
Tenant and Other Receivables, net:	Tenant and Other Receivables, net: Included in tenant and other receivables, net, is an allowance for doubtful accounts of $3,273 and $3,234 at September 30, 2015 and December 31, 2014, respectively. Also included in tenant and other receivables, net, are accrued percentage rents of $3,480 and $13,436 at September 30, 2015 and December 31, 2014, respectively, and a deferred rent receivable due to straight-line rent adjustments of $60,516 and $57,278 at September 30, 2015 and December 31, 2014, respectively. On March 17, 2014, in connection with the sale of Lake Square Mall (See Note 14—Dispositions), the Company issued a note receivable for $6,500 that bears interest at an effective rate of 6.5% and matures on March 17, 2018 ("LSM Note A") and a note receivable for $3,103 that bore interest at 5.0% and was to mature on December 31, 2014 ("LSM Note B"). On September 2, 2014, the balance of LSM Note B was paid in full. LSM Note A is collateralized by a trust deed on Lake Square Mall. At September 30, 2015 and December 31, 2014, LSM Note A had a balance of $6,371 and $6,436, respectively.

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.