Related Party Transactions and Arrangements (Schedule of General and Administrative Expenses Absorbed) (Details) (Manager [Member], ARC Properties Advisors, LLC [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended
	Mar. 31, 2013 Absorbed General and Administrative Expenses [Member]	Mar. 31, 2012 Absorbed General and Administrative Expenses [Member]	Mar. 31, 2013 Absorbed General and Administrative Expenses, Receivable [Member]	Dec. 31, 2012 Absorbed General and Administrative Expenses, Receivable [Member]
Schedule of General and Administrative Expenses Absorbed [Line Items]
Related Party Transaction, Amounts of Transaction	$ 0	$ 84	$ 0	$ 0