Related Party Transactions and Arrangements (General and Administrative Expenses) (Details) (Affiliates of Former Manager [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Related party expenses	$ 16,089,000	$ 103,206,000	$ 826,000
Advisory Fees And Reimbursements [Member]
Related Party Transaction [Line Items]
Related party expenses	2,015,000	5,602,000	826,000
Equity Awards [Member]
Related Party Transaction [Line Items]
Related party expenses	$ 14,074,000	$ 97,604,000	$ 0