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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Changes in Accumulated Other Comprehensive Loss
Changes in the accumulated other comprehensive income (loss) ("AOCI") balance by component consisted of the following for the respective years:
(in thousands)
 
Defined Benefit Pension Items
 
Other
 
Total
 
 
 
 
 
 
 
As of December 31, 2016
 
$
(93,676
)
 
$
329

 
$
(93,347
)
Other comprehensive income (loss) before reclassifications, net of tax of $2,814 and ($136)
 
6,880

 
(355
)
 
6,525

Amounts reclassified from AOCI, net of tax of $1,338
 
3,270

 
—

 
3,270

Net current-period other comprehensive income (loss)
 
10,150

 
(355
)
 
9,795

Reclassification of disproportionate tax effects from AOCI
 
(19,429
)
 
59

 
(19,370
)
As of December 31, 2017
 
(102,955
)
 
33

 
(102,922
)
Other comprehensive income (loss) before reclassifications, net of tax of $(1,803) and ($22)
 
(5,351
)
 
(65
)
 
(5,416
)
Amounts reclassified from AOCI, net of tax of $4,360
 
12,941

 
—

 
12,941

Net current-period other comprehensive income (loss)
 
7,590

 
(65
)
 
7,525

As of December 31, 2018

$
(95,365
)

$
(32
)
 
$
(95,397
)