Related Party Transactions and Arrangements (Acquisition Related Expenses) (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Related party expenses		$ 8,500,000
Affiliates of Former Manager [Member]
Related Party Transaction [Line Items]
Related party expenses		8,500,000
Affiliates of Former Manager [Member] | Strategic and Financial Advisory Services Fee [Member]
Related Party Transaction [Line Items]
Payments of related party expenses	$ 0
Affiliates of Former Manager [Member] | Acquisition Related Expenses [Member]
Related Party Transaction [Line Items]
Percentage of contract purchase price			1.00%
Affiliates of Former Manager [Member] | Acquisition Fees and Reimbursements [Member]
Related Party Transaction [Line Items]
Related party expenses	0	0	$ 12,300,000
Fortress Portfolio [Member] | Affiliates of Former Manager [Member] | Strategic and Financial Advisory Services Fee [Member]
Related Party Transaction [Line Items]
Payments of related party expenses	0	$ 1,000,000
Percentage of contract purchase price		0.25%
Fortress Portfolio [Member] | Affiliates of Former Manager [Member] | Acquisition Related Expenses [Member]
Related Party Transaction [Line Items]
Percentage of contract purchase price			0.25%
Related party expenses	0		$ 3,500,000
Inland Portfolio [Member] | Affiliates of Former Manager [Member] | Strategic and Financial Advisory Services Fee [Member]
Related Party Transaction [Line Items]
Payments of related party expenses		$ 600,000
Percentage of contract purchase price		0.25%
GE Capital Portfolio [Member] | Affiliates of Former Manager [Member] | Strategic and Financial Advisory Services Fee [Member]
Related Party Transaction [Line Items]
Payments of related party expenses	0	$ 0	$ 1,900,000
Percentage of contract purchase price			0.25%
GE Capital Portfolio [Member] | Affiliates of Former Manager [Member] | Acquisition Fees and Reimbursements [Member]
Related Party Transaction [Line Items]
Payments of related party expenses		$ 0	$ 6,100,000
GE Capital Portfolio [Member] | Affiliates of Former Manager [Member] | Acquisition Fee [Member]
Related Party Transaction [Line Items]
Payments of related party expenses	$ 0		$ 13,800,000