Derivative Instruments (Schedule of Concentration Risk Percentage) (Details) (Derivative Credit Risk [Member])	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Concentration Risk [Line Items]
Concentration Risk, Percentage	100.00%	100.00%
Wells Fargo [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	41.00%	23.00%
Credit Suisse [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	23.00%	46.00%
Societe Generale [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	22.00%	31.00%
Regions [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	8.00%	0.00%
Union Bank [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	4.00%	0.00%
Royal Bank of Canada [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	2.00%	0.00%