Noncontrolling Interests (Property Partnerships) (Narrative) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property partnerships	$ 996	$ 614
Noncontrolling Interests [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property partnerships	$ (1,000)	$ (600)