Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements and Derivatives - Effects of fuel options which were not designated as hedging instruments (Details 5)

v3.3.1.900
Fair Value Measurements and Derivatives - Effects of fuel options which were not designated as hedging instruments (Details 5) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Not Designated as Hedging Instrument | Fuel Options      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain recognized in other income (expense) $ (864) $ 1,340