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Changes in Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Schedule of Changes in Accumulated Other Comprehensive Income/(Loss) by Component
Changes in Accumulated Other Comprehensive Loss by component, net of tax, were as follows:
 
Long-Term Liabilities
Balance at December 31, 2017
$
(8,476
)
Amounts Reclassified from Accumulated Other Comprehensive Loss, net of tax
170

Balance at March 31, 2018
$
(8,306
)
Schedule of Reclassification of Adjustments to Accumulated Other Comprehensive Income
The following table shows the reclassification of adjustments out of Accumulated Other Comprehensive Loss:
 
For the Three Months Ended March 31,
 
2018
 
2017
Actuarially Determined Long-Term Liability Adjustments
 
 
 
Amortization of Prior Service Costs
$
(90
)
 
$
(749
)
Recognized Net Actuarial Loss
354

 
6,303

Total
264

 
5,554

Less: Tax Benefit
94

 
2,052

Net of Tax
$
170

 
$
3,502