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Noncontrolling Interest - Limited Partners' Mezzanine OP Units (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Nonconcontrolling Interest - Limited Partners' Mezzanine OP Units [Abstract]      
Balance, beginning of year $ 4,616,000 $ 7,053,000  
Net income (loss) 9,000 (1,126,000)  
Unrealized gain on change in fair value of cash flow hedges   (3,000)  
Total other comprehensive loss 9,000 (1,129,000)  
Distributions (25,000) (232,000)  
Conversions of OP Units into common stock (3,897,000)   (209,000)
Reallocation adjustment of limited partners' interest (80,000) (1,076,000)  
Balance, end of year $ 623,000 $ 4,616,000 $ 7,053,000