Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Tenant Receivables [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, beginning of year	$ 1,977	$ 1,760	$ 3,167
Additions in allowance charged to expense	1,253	798	1,670
Transfer to/from other receivables - allowance	0	0	(1,400)
Bad debts charged against allowance	(851)	(581)	(1,677)
Balance, end of year	2,379	1,977	1,760
Allowance for Other Receivables [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, beginning of year	1,270	1,400	0
Additions in allowance charged to expense	0	0	0
Transfer to/from other receivables - allowance	0	0	1,400
Bad debts charged against allowance	(29)	(130)	0
Balance, end of year	$ 1,241	$ 1,270	$ 1,400