Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements and Derivatives - Effects of derivatives designated as cash flow hedges (Details 2)

v3.6.0.2
Fair Value Measurements and Derivatives - Effects of derivatives designated as cash flow hedges (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]      
Loss recognized in other income (expense), net - ineffective portion   $ (30,700) $ (6,900)
Designated as Hedging Instrument | Cash Flow Hedging | Fuel Swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in other comprehensive income (loss) - effective portion $ 127,470 (173,513) (198,595)
Loss recognized in other income (expense), net - ineffective portion (12,850) (16,011) (5,753)
Amount reclassified from accumulated other comprehensive income (loss) into other income (expense) $ 85,448 $ 75,808 $ 8,388