Derivative Financial Instruments - Income Statement Effect (Details) (USD $)	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative instruments	$ (1,693,292)	$ (483,925)
Eurodollar Future [Member]
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative instruments	(1,537,000)	(484,000)
Interest Rate Swaption [Member]
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative instruments	$ (156,479)	$ 0

Aggregate net gain and losses (whether realized or unrealized) on all derivative instruments held for trading purposes whether or not settled physically.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41322-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4F

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624186-113959

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration