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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Changes in accumulated other comprehensive income (loss) by Component:
For the three months ended March 31, 2017
Pension and Other Postretirement Adjustments
 
Changes in Fair Value of Effective Cash Flow Hedges
 
Total
Balance at December 31, 2016
$
(1,493
)
 
$
9

 
$
(1,484
)
Other comprehensive (loss) income before reclassifications
(5
)
 
92

 
87

Amounts reclassified from accumulated other comprehensive income
—

 
—

 
—

Net current period other comprehensive (loss) income
(5
)
 
92

 
87

Balance at March 31, 2017
$
(1,498
)
 
$
101

 
$
(1,397
)
 
 
 
 
 
 
For the three months ended March 31, 2016
Pension and Other Postretirement Adjustments
 
Changes in Fair Value of Effective Cash Flow Hedges
 
Total
Balance at December 31, 2015
$
(2,842
)
 
$
48

 
$
(2,794
)
Other comprehensive loss before reclassifications
(142
)
 
(358
)
 
(500
)
Amounts reclassified from accumulated other comprehensive income
—

 
—

 
—

Net current period other comprehensive loss
(142
)
 
(358
)
 
(500
)
Balance at March 31, 2016
$
(2,984
)
 
$
(310
)
 
$
(3,294
)