Investments In Marketable Securities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Marketable Securities [Abstract]
Available-for-sale Securities, Gross Unrealized Gains	$ 9,903	$ 8,562
Fannie Mae term loans - secured (including a premium of $1,756)	$ 79,503		$ 80,080