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Accumulated Other Comprehensive Income (Loss) (Notes)
 6 Months Ended
Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated Other Comprehensive Income (Loss)
Changes in Accumulated Other Comprehensive Income by Component:
For the three months ended June 30, 2015
Pension and Other Postretirement Adjustments
 
Changes in Fair Value of Effective Cash Flow Hedges
 
Total
Balance at March 31, 2015
$
(2,877
)
 
$
(75
)
 
$
(2,952
)
Other comprehensive income (loss) before reclassifications
14

 
36

 
50

Amounts reclassified from accumulated other comprehensive income
—

 
—

 
—

Net current period other comprehensive income (loss)
14

 
36

 
50

Balance at June 30, 2015
$
(2,863
)
 
$
(39
)
 
$
(2,902
)
 
 
 
 
 
 
For the three months ended June 30, 2014
Pension and Other Postretirement Adjustments
 
Changes in Fair Value of Effective Cash Flow Hedges
 
Total
Balance at March 31, 2014
$
(2,165
)
 
$
670

 
$
(1,495
)
Other comprehensive income before reclassifications
(50
)
 
(384
)
 
(434
)
Amounts reclassified from accumulated other comprehensive income
—

 
—

 
—

Net current period other comprehensive income
(50
)
 
(384
)
 
(434
)
Balance at June 30, 2014
$
(2,215
)
 
$
286

 
$
(1,929
)


For the six months ended June 30, 2015
Pension and Other Postretirement Adjustments
 
Changes in Fair Value of Effective Cash Flow Hedges
 
Total
Balance at December 31, 2014
$
(3,175
)
 
$
362

 
$
(2,813
)
Other comprehensive income (loss) before reclassifications
312

 
(401
)
 
(89
)
Amounts reclassified from accumulated other comprehensive income (loss)
—

 
—

 
—

Net current period other comprehensive income (loss)
312

 
(401
)
 
(89
)
Balance at June 30, 2015
$
(2,863
)
 
$
(39
)
 
$
(2,902
)
 
 
 
 
 
 
For the six months ended June 30, 2014
Pension and Other Postretirement Adjustments
 
Changes in Fair Value of Effective Cash Flow Hedges
 
Total
Balance at December 31, 2013
$
(2,287
)
 
$
722

 
$
(1,565
)
Other comprehensive income (loss) before reclassifications
72

 
(436
)
 
(364
)
Amounts reclassified from accumulated other comprehensive income (loss)
—

 
—

 
—

Net current period other comprehensive income (loss)
72

 
(436
)
 
(364
)
Balance at June 30, 2014
$
(2,215
)
 
$
286

 
$
(1,929
)