Summary of Significant Accounting Policies (Schedule of Restricted Deposits and Mortgage Escrows) (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Restricted cash	[1]	$ 8,838	$ 77,739
Mortgage escrows		2,640	2,259
Total		11,478	$ 79,998
Qualified escrow, use of funds		77,400
Qualified escrow for like-kind exchange, proceeds		$ 5,800

[1] The decrease between the periods presented is primarily attributable to the use of funds from a qualified escrow account of $77.4 million, offset by $5.8 million of funds placed in a qualified escrow account for the purpose of completing like-kind exchange transactions.