Real Estate Investments - Schedule of Business Acquisitions, by Acquisition (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($) property
Real estate investments, at cost:
Land	$ 6,867
Buildings, fixtures and improvements	31,635
Total tangible assets	38,502
Intangibles acquired:
Total assets acquired, net	47,184
Cash paid for acquired real estate investments	$ 47,184
Number of properties purchased | property	4
In-place leases
Intangibles acquired:
Acquired intangibles	$ 8,571
Above market lease assets
Intangibles acquired:
Acquired intangibles	166
Below market lease liabilities
Intangibles acquired:
Acquired intangibles	(632)
Below market ground lease assets
Intangibles acquired:
Acquired intangibles	$ 577