Investment in Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Investment in Marketable Securities (Textual) [Abstract]
Investment in marketable securities	$ 139,158		$ 139,158		$ 242,819
Impairment on securities included as a component of realized gain (loss)	97,279		97,279		171,450
Net accumulated other comprehensive income			41,879		71,369
Gross unrealized losses			1,769		3,189
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	23,394		23,394		11,982
Impairments on available for sale securities	0	0	0	0
Dividend Income, Operating	$ 2,193	$ 3,990	$ 9,581	$ 12,813