Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2011	Dec. 31, 2010
Construction In Progress [Abstract]
Properties	3
Approximate Square Feet, whole units	377,723
CIP	$ 104,741	$ 80,262
Estimated Remaining Funding	52,487
Estimated total investment	136,455
Washington [Member]
Construction In Progress [Abstract]
Estimated Completion Date	4Q 2011
Property Type	MOB
Properties	1
Approximate Square Feet, whole units	191,051
CIP	63,175
Estimated Remaining Funding	29,025
Estimated total investment	92,200
Colorado Estimated Completion Date One [Member]
Construction In Progress [Abstract]
Estimated Completion Date	4Q 2011
Property Type	MOB
Properties	1
Approximate Square Feet, whole units	96,093
CIP	10,982
Estimated Remaining Funding	11,676
Estimated total investment	22,658
Colorado Estimated Completion Date Two [Member]
Construction In Progress [Abstract]
Estimated Completion Date	1Q 2012
Property Type	MOB
Properties	1
Approximate Square Feet, whole units	90,579
CIP	9,811
Estimated Remaining Funding	11,786
Estimated total investment	21,597
Texas [Member]
Construction In Progress [Abstract]
CIP	$ 20,773