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Fair Value - Assets and Liabilities Measured at Fair Value and Related Hierarchy Levels (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Assets:    
Total available-for-sale securities $ 24,160 $ 18,562
Executive deferred compensation plan trust 5,716 5,655
Fuel price derivatives   5,007
Liabilities:    
Foreign currency swaps 9 90
Mortgage-backed securities    
Assets:    
Total available-for-sale securities 499 650
Asset-backed securities    
Assets:    
Total available-for-sale securities 688 848
Municipal bonds    
Assets:    
Total available-for-sale securities 708 398
Fixed-income mutual fund    
Assets:    
Total available-for-sale securities 22,265 16,666
Fuel price derivatives - unleaded fuel    
Assets:    
Fuel price derivatives   3,083
Fuel price derivatives – diesel    
Assets:    
Fuel price derivatives   1,924
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Total available-for-sale securities 22,265 16,666
Executive deferred compensation plan trust 5,716 5,655
Fuel price derivatives   0
Liabilities:    
Foreign currency swaps 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities    
Assets:    
Total available-for-sale securities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities    
Assets:    
Total available-for-sale securities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal bonds    
Assets:    
Total available-for-sale securities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed-income mutual fund    
Assets:    
Total available-for-sale securities 22,265 16,666
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fuel price derivatives - unleaded fuel    
Assets:    
Fuel price derivatives   0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fuel price derivatives – diesel    
Assets:    
Fuel price derivatives   0
Significant Other Observable Inputs (Level 2)    
Assets:    
Total available-for-sale securities 1,895 1,896
Executive deferred compensation plan trust 0 0
Fuel price derivatives   3,083
Liabilities:    
Foreign currency swaps 9 90
Significant Other Observable Inputs (Level 2) | Mortgage-backed securities    
Assets:    
Total available-for-sale securities 499 650
Significant Other Observable Inputs (Level 2) | Asset-backed securities    
Assets:    
Total available-for-sale securities 688 848
Significant Other Observable Inputs (Level 2) | Municipal bonds    
Assets:    
Total available-for-sale securities 708 398
Significant Other Observable Inputs (Level 2) | Fixed-income mutual fund    
Assets:    
Total available-for-sale securities 0 0
Significant Other Observable Inputs (Level 2) | Fuel price derivatives - unleaded fuel    
Assets:    
Fuel price derivatives   3,083
Significant Other Observable Inputs (Level 2) | Fuel price derivatives – diesel    
Assets:    
Fuel price derivatives   0
Significant Unobservable Inputs (Level 3)    
Assets:    
Total available-for-sale securities 0 0
Executive deferred compensation plan trust 0 0
Fuel price derivatives   1,924
Liabilities:    
Foreign currency swaps 0 0
Significant Unobservable Inputs (Level 3) | Mortgage-backed securities    
Assets:    
Total available-for-sale securities 0 0
Significant Unobservable Inputs (Level 3) | Asset-backed securities    
Assets:    
Total available-for-sale securities 0 0
Significant Unobservable Inputs (Level 3) | Municipal bonds    
Assets:    
Total available-for-sale securities 0 0
Significant Unobservable Inputs (Level 3) | Fixed-income mutual fund    
Assets:    
Total available-for-sale securities $ 0 0
Significant Unobservable Inputs (Level 3) | Fuel price derivatives - unleaded fuel    
Assets:    
Fuel price derivatives   0
Significant Unobservable Inputs (Level 3) | Fuel price derivatives – diesel    
Assets:    
Fuel price derivatives   $ 1,924