Related Party Transactions and Arrangements (Offering Related Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Related party expenses		$ 8,500
Affiliates of Former Manager [Member]
Related Party Transaction [Line Items]
Related party expenses		8,500
Affiliates of Former Manager [Member] | Commissions And Fees [Member]
Related Party Transaction [Line Items]
Related party expenses	$ 0	0	$ 148,232
Affiliates of Former Manager [Member] | Offering Costs and Other Reimbursements [Member]
Related Party Transaction [Line Items]
Related party expenses	0	2,150	13,564
Affiliates of Former Manager [Member] | Offering Related Costs [Member]
Related Party Transaction [Line Items]
Related party expenses	$ 0	$ 2,150	$ 161,796