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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Real Estate Properties [Line Items]
Costs incurred to date	$ 332,737
Expected costs to complete	368,080
Wholly owned under development [Member]
Real Estate Properties [Line Items]
Number of Properties	5
Costs incurred to date	282,006
Expected costs to complete	319,094
Ownership stake	100.00%
Consolidated Joint Ventures [Member]
Real Estate Properties [Line Items]
Number of Properties	1
Costs incurred to date	13,857
Expected costs to complete	32,143
Ownership stake	90.00%
Unconsolidated Joint Ventures [Member]
Real Estate Properties [Line Items]
Number of Properties	2
Costs incurred to date	36,874
Expected costs to complete	$ 16,843
Ownership stake	95.00%

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The number of real estate properties owned as of the balance sheet date.

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