Real Estate - Portfolio (Remaining Funding Commitments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 properties
Real Estate Investments, Net [Abstract]
Number of Properties with Funding Commitments	54
Total Commitment	$ 164,420	[1]
Amount Funded	127,235
Remaining Commitment	$ 37,185

[1] Includes land, construction costs and tenant improvements.