Acquisitions Allocation of Purchase Price (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Land	$ 31,337
Buildings and garages	121,369
Tenant improvements	13,434
Lease commissions	6,056
Lease in place value	15,862
Above market leases	2,936
Below market leases	$ (5,735)
Lease commisions
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average life (in years)	4 years
Leases, Acquired-in-Place
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average life (in years)	4 years
Above Market Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average life (in years)	4 years 0 months 0 days
Below Market Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average life (in years)	7 years 0 months 0 days
Building
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average life (in years)	40 years 0 months 0 days
Building Improvements
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average life (in years)	5 years