Derivative Financial Instruments - Summary of Derivative Positions (Details)	3 Months Ended
Mar. 31, 2015 Australian Dollar/USD [Member] Sell [Member] USD ($)	Mar. 31, 2015 USD/British Pound [Member] Sell [Member] GBP (£)	Mar. 31, 2015 EURO/British Pound [Member] Sell [Member] GBP (£)	Mar. 31, 2015 Interest Rate Swap [Member] USD ($)
Derivative [Line Items]
Notional Amount	$ 2,756,914	£ 1,900,000	£ 8,000,000	$ 156,406,250
Weighted Average Remaining Maturity In Years	2 months	2 months	2 months	1 year 3 months
Average Exchange Rate	0.76	1.48	0.73

Nominal or face amount used to calculate payments on the derivative asset.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

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