Financing Receivables (Details 4) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Book Value	$ 159	$ 7,835
Amount of Payments Past Due 30-59 Days	9	88
Amount of Payments Past Due 60-89 Days
Amount of Payments Past Due > 90 Days
Amount of Payments Past Due, Total	9	88
Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Book Value
Amount of Payments Past Due 30-59 Days
Amount of Payments Past Due 60-89 Days
Amount of Payments Past Due > 90 Days
Amount of Payments Past Due, Total
Medical [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Book Value		7,019
Amount of Payments Past Due 30-59 Days		75
Amount of Payments Past Due 60-89 Days
Amount of Payments Past Due > 90 Days
Amount of Payments Past Due, Total		75
Office [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Book Value	159	816
Amount of Payments Past Due 30-59 Days	9	13
Amount of Payments Past Due 60-89 Days
Amount of Payments Past Due > 90 Days
Amount of Payments Past Due, Total	9	13
Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Book Value
Amount of Payments Past Due 30-59 Days
Amount of Payments Past Due 60-89 Days
Amount of Payments Past Due > 90 Days
Amount of Payments Past Due, Total