Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Consolidated financial statements of fuel swaps dedesignated and immediately recognized into earnings (Details 3)

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Fair Value Measurements and Derivatives - Consolidated financial statements of fuel swaps dedesignated and immediately recognized into earnings (Details 3) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reclassification out of Accumulated Other Comprehensive Income | Fuel Swaps        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amount reclassified from accumulated other comprehensive income (loss) into other income (expense) $ 10,000   $ 10,000