Hedging - Hedge Portfolio Table (Details)	Jun. 30, 2014 Average rate forward, settlement period - 2014 Designated as Hedging Instrument [Member] Average rate forward contracts USD ($)	Jun. 30, 2014 Average rate forward, settlement period - 2014 Designated as Hedging Instrument [Member] Average rate forward contracts EUR (€)	Jun. 30, 2014 Average rate forward, settlement period - 2015 Designated as Hedging Instrument [Member] Average rate forward contracts USD ($)		Jun. 30, 2014 Average rate forward, settlement period - 2015 Designated as Hedging Instrument [Member] Average rate forward contracts EUR (€)		Jun. 30, 2014 Commodity forward contract, settlement period - 2014 Designated as Hedging Instrument [Member] Bunker fuel forward contracts Mg	Jun. 30, 2014 Commodity forward contract, settlement period - 2015 Designated as Hedging Instrument [Member] Bunker fuel forward contracts Mg		Jun. 30, 2014 30-day euro forward contracts 30-day euro forward contracts, settlement period - July 2014 USD ($)	Jun. 30, 2014 30-day euro forward contracts 30-day euro forward contracts, settlement period - July 2014 EUR (€)	Jun. 30, 2013 Purchased Foreign exchange option, settlement period - 2014 Euro put option EUR (€)	Jun. 30, 2014 Purchased Foreign exchange option, settlement period - 2014 Designated as Hedging Instrument [Member] Euro put option USD ($)	Jun. 30, 2014 Purchased Foreign exchange option, settlement period - 2014 Designated as Hedging Instrument [Member] Euro put option EUR (€)	Jun. 30, 2013 Purchased Foreign exchange option, settlement period - 2015 Euro put option EUR (€)	Jun. 30, 2014 Purchased Foreign exchange option, settlement period - 2015 Designated as Hedging Instrument [Member] Euro put option USD ($)	Jun. 30, 2014 Purchased Foreign exchange option, settlement period - 2015 Designated as Hedging Instrument [Member] Euro put option EUR (€)	Jun. 30, 2013 Sold Foreign exchange option, settlement period - 2014 Euro call option EUR (€)	Jun. 30, 2014 Sold Foreign exchange option, settlement period - 2014 Designated as Hedging Instrument [Member] Euro call option USD ($)	Jun. 30, 2014 Sold Foreign exchange option, settlement period - 2014 Designated as Hedging Instrument [Member] Euro call option EUR (€)	Jun. 30, 2013 Sold Foreign exchange option, settlement period - 2015 Euro call option EUR (€)	Jun. 30, 2014 Sold Foreign exchange option, settlement period - 2015 Designated as Hedging Instrument [Member] Euro call option USD ($)	Jun. 30, 2014 Sold Foreign exchange option, settlement period - 2015 Designated as Hedging Instrument [Member] Euro call option EUR (€)
Derivative [Line Items]
Currency derivatives - Notional Amount		€ 64,000,000			€ 14,000,000	[1]					€ 49,000,000	€ 25,000,000		€ 87,000,000	€ 19,000,000		€ 113,000,000	€ 25,000,000		€ 87,000,000	€ 19,000,000		€ 113,000,000
Fuel derivatives - Notional Amount							43,266	59,800	[1]
Currency derivatives - Contract Average Rate/Price (in $ per EUR)	1.36		1.38	[1]						1.36			1.33			1.36			1.39			1.40
Fuel derivatives - Contract Average Rate/Price (in $ per mt)							592	556	[1]

[1] Settlement periods for bunker fuel forward contracts and currency derivatives are through September 2015 and June 2015, respectively.