Financial Instruments Foreign currency forward contracts (Details) - Jun. 30, 2016 - Not Designated as Hedging Instrument - Forward Contracts	GBP (£)	SEK	EUR (€)	INR (₨)	NOK	USD ($)
NOK/EUR | Currency Purchased Forward
Derivative [Line Items]
Outstanding foreign currency forward contract | NOK					NOK 41,200,000
NOK/EUR | Currency Sold Forward
Derivative [Line Items]
Outstanding foreign currency forward contract			€ 4,473,253
USD/EUR | Currency Purchased Forward
Derivative [Line Items]
Outstanding foreign currency forward contract			747,004
USD/EUR | Currency Sold Forward
Derivative [Line Items]
Outstanding foreign currency forward contract | $						$ 1,000,000
EUR/GBP | Currency Purchased Forward
Derivative [Line Items]
Outstanding foreign currency forward contract			11,100,000
EUR/GBP | Currency Sold Forward
Derivative [Line Items]
Outstanding foreign currency forward contract | £	£ 8,661,110
EUR/SEK | Currency Purchased Forward
Derivative [Line Items]
Outstanding foreign currency forward contract			1,300,000
EUR/SEK | Currency Sold Forward
Derivative [Line Items]
Outstanding foreign currency forward contract | SEK		SEK 12,067,120
INR/USD | Currency Purchased Forward
Derivative [Line Items]
Outstanding foreign currency forward contract | ₨				₨ 229,614,910
INR/USD | Currency Sold Forward
Derivative [Line Items]
Outstanding foreign currency forward contract | $						3,400,000
INR/EUR | Currency Purchased Forward
Derivative [Line Items]
Outstanding foreign currency forward contract | ₨				₨ 334,635,755
INR/EUR | Currency Sold Forward
Derivative [Line Items]
Outstanding foreign currency forward contract			€ 4,450,000
USD/GBP | Currency Purchased Forward
Derivative [Line Items]
Outstanding foreign currency forward contract | £	£ 1,382,896
USD/GBP | Currency Sold Forward
Derivative [Line Items]
Outstanding foreign currency forward contract | $						$ 2,100,000