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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2013
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
 
 
Pension and retiree medical liability
 
Unrealized gain (loss) on investments
 
Derivative financial instruments
 
Income tax benefit (expense)
 
Total
Balance at December 31, 2012
 
$
(2,322
)
 
$
(1
)
 
$
15

 
$
(672
)
 
$
(2,980
)
     Other comprehensive income (loss) before reclassifications
 
—

 
(1
)
 
(15
)
 
—

 
(16
)
     Amounts reclassified from accumulated other comprehensive income (loss)
 
(33
)
 
—

 
(1
)
 
—

 
(34
)
Net current-period other comprehensive income (loss)
 
$
(33
)
 
$
(1
)
 
$
(16
)
 
$
—

 
$
(50
)
Balance at March 31, 2013
 
$
(2,355
)
 
$
(2
)
 
$
(1
)
 
$
(672
)
 
$
(3,030
)
Details about accumulated other comprehensive income (loss) components
 
Amount reclassified from accumulated other comprehensive income (loss)
 
Affected line item in the statement where net income (loss) is presented
Amortization of pension and retiree medical liability
 
 
 
 
     Prior service cost
 
$
(54
)
 
1 
     Actuarial loss
 
21
 
 
1 
 
 
 
 
 
Derivative financial instruments
 
 
 
 
     Cash flow hedges
 
(1
)
 
Aircraft fuel
 
 
 
 
 
Total reclassifications for the period
 
$
(34
)