Financial Derivative Instruments - Fuel Hedging (Details) gal in Millions		Jun. 30, 2015 gal
Remainder of 2015
Volume of Fuel Hedging [Line Items]
Fuel Hedged (in gallons)	[1]	843
2016
Volume of Fuel Hedging [Line Items]
Fuel Hedged (in gallons)	[1]	1,672
2017
Volume of Fuel Hedging [Line Items]
Fuel Hedged (in gallons)	[1]	790
2018
Volume of Fuel Hedging [Line Items]
Fuel Hedged (in gallons)	[2]	0

[1] Due to the types of derivatives utilized by the Company and different price levels of those contracts, these volumes represent the maximum economic net hedge in place and may vary significantly as market prices fluctuate.

[2] In response to the precipitous decline in oil and jet fuel prices during the second half of 2014, the Company took action to offset its 2018 fuel derivative portfolio and remains effectively unhedged for 2018 at current price levels. While the Company still holds derivative contracts as of June 30, 2015, that will settle during 2018, the losses associated with those contracts are locked in.