Related Party Transactions and Arrangements (Asset Management Fees) (Narrative) (Details)	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) criteria shares	Jun. 30, 2014 USD ($) shares	Dec. 31, 2013 shares
ARCT IV [Member] | Advisor [Member] | Asset Management Fee [Member]
Related Party Transaction [Line Items]
Cumulative, pre-tax, non-compounded return		6.00%
Number of criteria for vesting | criteria		1
Percent used to calculate asset management fees		0.1875%
Calculation of asset management fees, denominator (shares)		1
Member Units [Member] | ARCT IV [Member] | Affiliates of Former Manager, Five [Member] | Asset Management Fees [Member]
Related Party Transaction [Line Items]
Stock issued in lieu of cash for management fees, shares			498,857	492,483
Exchange ratio to convert Class B Units into OP Units			2.3961
Selling, general and administrative expenses from transactions with related party | $	$ 0	$ 0	$ 13,900,000