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Condensed Consolidated Statements of Capital (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	$ 1,003,185
Net income	11,231
Equity compensation	1,025
Distributions	(20,901)
Ending balance	994,540
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	4,369
Equity compensation (in units)	13
Equity compensation	125
Distributions	(8,128)
Ending balance (in units)	95,619
Ending balance	381,524
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	3,875
Equity compensation (in units)	405
Equity compensation	900
Distributions	(7,224)
Ending balance (in units)	84,994
Ending balance	569,314
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	2,111
Distributions	(3,921)
Ending balance (in units)	46,134
Ending balance	30,888
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	573
Distributions	(1,069)
Ending balance (in units)	12,570
Ending balance	8,370
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	303
Distributions	(559)
Ending balance (in units)	6,578
Ending balance	$ 4,444

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The amount of ownership interest of different classes of partners in limited partnership.

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Total distributions to each class of partners (i.e., general, limited and preferred partners).

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Total change in each class of partners' capital accounts during the year due to unit-based compensation. All partners include general, limited and preferred partners.

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The number of each class of partnership units outstanding at the balance sheet date. Units represent shares of ownership of the general, limited, and preferred partners.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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