Real Estate Investments (Assets and Liabilities Assumed) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 property
Real estate investments, at cost:
Land	$ 17,500
Buildings, fixtures and improvements	90,869
Total tangible assets	108,369
Below-market lease liabilities	(6,176)
Total acquired intangibles	3,631
Total assets acquired, net	112,000
Mortgage notes payable used to acquire investments in real estate	(60,000)
Other liabilities assumed	(843)
Cash paid for acquired real estate investments and other assets	51,157
Number of properties and other investments purchased	1
In-place leases
Real estate investments, at cost:
Acquired intangibles:	8,214
Above-market lease assets
Real estate investments, at cost:
Acquired intangibles:	$ 1,593