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Condensed Consolidated Statements of Capital (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance   $ 1,003,185
Net income 25,281 36,512
Equity compensation   1,970
Distributions   (41,823)
Ending balance 999,844 999,844
General Partner [Member] | Series PR Operating Partnership Units [Member]
    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   95,606
Beginning balance   385,158
Net income   14,203
Equity compensation (in units)   2
Equity compensation   300
Distributions   (16,282)
Ending balance (in units) 95,608 95,608
Ending balance 383,379 383,379
Limited Partner [Member] | Series PR Operating Partnership Units [Member]
    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   84,589
Beginning balance   571,763
Net income   12,614
Equity compensation (in units)   484
Equity compensation   1,670
Distributions   (14,443)
Ending balance (in units) 85,073 85,073
Ending balance 571,604 571,604
Limited Partner [Member] | Series ES Operating Partnership Units [Member]
    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   46,134
Beginning balance   32,698
Net income   6,850
Distributions   (7,842)
Ending balance (in units) 46,134 46,134
Ending balance 31,706 31,706
Limited Partner [Member] | Series 60 Operating Partnership Units [Member]
    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   12,570
Beginning balance   8,866
Net income   1,866
Distributions   (2,136)
Ending balance (in units) 12,570 12,570
Ending balance 8,596 8,596
Limited Partner [Member] | Series 250 Operating Partnership Units [Member]
    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   6,578
Beginning balance   4,700
Net income   979
Distributions   (1,120)
Ending balance (in units) 6,578 6,578
Ending balance $ 4,559 $ 4,559