Related Party Transactions and Arrangements (Related Party Fees and Expenses) (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
Management Fees To Affiliates [Member]
Related Party Transaction [Line Items]
Related party expenses	$ 0	13,888	$ 17,462
Affiliates of Former Manager [Member]
Related Party Transaction [Line Items]
Related party expenses		8,500
Affiliates of Former Manager [Member] | Offering Related Costs [Member]
Related Party Transaction [Line Items]
Related party expenses	0	2,150	161,796
Affiliates of Former Manager [Member] | Indirect Affiliate Expenses [Member]
Related Party Transaction [Line Items]
Related party expenses	0	10,975	68
Affiliated Entity [Member] | Total Expenses and Capitalized Costs [Member]
Related Party Transaction [Line Items]
Related party expenses	0	182,532	490,519
Affiliated Entity [Member] | Financing Feed and Reimbursements [Member]
Related Party Transaction [Line Items]
Related party expenses	0	0	14,277
Affiliated Entity [Member] | Offering Related Costs [Member]
Related Party Transaction [Line Items]
Related party expenses	0	2,150	161,796
Affiliated Entity [Member] | Acquisition Related Expenses [Member]
Related Party Transaction [Line Items]
Related party expenses	0	1,652	37,564
Affiliated Entity [Member] | Merger And Other Non-Routine Transactions [Member]
Related Party Transaction [Line Items]
Related party expenses	0	137,778	156,146
Affiliated Entity [Member] | Management Fees To Affiliates [Member]
Related Party Transaction [Line Items]
Related party expenses	0	13,888	17,462
Affiliated Entity [Member] | General and Administrative Expense [Member]
Related Party Transaction [Line Items]
Related party expenses	0	16,089	103,206
Affiliated Entity [Member] | Indirect Affiliate Expenses [Member]
Related Party Transaction [Line Items]
Related party expenses	$ 0	$ 10,975	$ 68