Financial Instruments (Details)	3 Months Ended
	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] EUR/NOK [Member] Forward Contracts [Member] Short [Member] EUR (€)	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] EUR/NOK [Member] Forward Contracts [Member] Long [Member] NOK	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] EUR/NOK 2 [Member] Forward Contracts [Member] Short [Member] EUR (€)	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] EUR/NOK 2 [Member] Forward Contracts [Member] Long [Member] NOK	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] EUR/USD 1 [Member] Forward Contracts [Member] Short [Member] EUR (€)	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] EUR/USD 1 [Member] Forward Contracts [Member] Long [Member] USD ($)	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] EUR/USD 2 [Member] Forward Contracts [Member] Short [Member] EUR (€)	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] EUR/USD 2 [Member] Forward Contracts [Member] Long [Member] USD ($)	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] EUR/GBP [Member] Forward Contracts [Member] Short [Member] EUR (€)	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] EUR/GBP [Member] Forward Contracts [Member] Long [Member] GBP (£)	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] EUR/AUD [Member] Forward Contracts [Member] Short [Member] EUR (€)	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] EUR/AUD [Member] Forward Contracts [Member] Long [Member] AUD	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] SEK/EUR [Member] Forward Contracts [Member] Short [Member] SEK	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] SEK/EUR [Member] Forward Contracts [Member] Long [Member] EUR (€)	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] USD/INR [Member] Forward Contracts [Member] Short [Member] USD ($)	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] USD/INR [Member] Forward Contracts [Member] Long [Member] INR	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] EUR/INR2 [Member] Forward Contracts [Member] Short [Member] USD ($)	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] EUR/INR2 [Member] Forward Contracts [Member] Long [Member] INR	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] EUR/INR [Member] Forward Contracts [Member] Short [Member] EUR (€)	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] EUR/INR [Member] Forward Contracts [Member] Long [Member] INR
Derivative [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ 2,500,000	$ 300,000
Derivative, Notional Amount			€ 3,055,918	26,500,000	€ 1,612,272	14,000,000	€ 8,097,543	$ 8,700,000	€ 5,584,512	$ 6,000,000	€ 1,657,688	£ 1,200,000	€ 1,417,033	2,000,000	16,690,140	€ 1,800,000	$ 5,400,000	339,530,400	$ 1,800,000	112,188,960	€ 1,000,000	68,056,700