Mergers with Real Estate Businesses (Cole Credit Property Trust, Inc. Merger) (Narrative) (Details) - Cole Credit Property Trust, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands			7 Months Ended
	May. 20, 2014	May. 19, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Consideration transferred		$ 73,200
Consideration transferred, amount per share (in dollars per share)		$ 7.25
Fair value of consideration transferred in cash		$ 73,159
Estimated fair value of assets		159,514
Below-market lease liability		$ 1,752
Revenue of acquiree since acquisition date			$ 8,200
Earnings or loss of acquiree since acquisition date			$ 1,800
Common Stock [Member]
Business Acquisition [Line Items]
Equity interest in acquiree (shares)		7,735,068.68
Step acquisition, equity interest in acquiree, including subsequent acquisition	90.00%	77.00%
Shares issued (shares)	13,457,874
Number of shares greater than 90% of voting interest acquired	1