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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 2018
Accumulated Other Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Loss
Changes in accumulated other comprehensive income (loss) ("AOCI") by component, including items reclassified out of AOCI, were as follows:
 
 
Three Months Ended June 30, 2018
(in thousands)
 
Defined Benefit Pension Items
 
Other
 
Total
 
 
 
 
 
 
 
Beginning balance, March 31, 2018
 
$
(102,215
)
 
$
33

 
$
(102,182
)
  Other comprehensive income before reclassifications
 
—

 
—

 
—

  Amounts reclassified from accumulated other
  comprehensive loss:
 
 
 
 
 
 
     Actuarial gain (loss), net of tax of $249 (a)
 
740

 
—

 
740

Net current-period other comprehensive income
 
740

 
—

 
740

Ending balance, June 30, 2018
 
$
(101,475
)
 
$
33

 
$
(101,442
)

 
 
Three Months Ended June 30, 2017
(in thousands)
 
Defined Benefit Pension Items
 
Other
 
Total
 
 
 
 
 
 
 
Beginning balance, March 31, 2017
 
$
(92,981
)
 
$
313

 
$
(92,668
)
  Other comprehensive income before reclassifications
 
—

 
—

 
—

  Amounts reclassified from accumulated other
  comprehensive loss:
 
 
 
 
 
 
     Actuarial gain (loss), net of tax of $423 (a)
 
695

 
(16
)
 
679

Net current-period other comprehensive income (loss)
 
695

 
(16
)
 
679

Ending balance, June 30, 2017
 
$
(92,286
)
 
$
297

 
$
(91,989
)


 
 
Six Months Ended June 30, 2018
(in thousands)
 
Defined Benefit Pension Items
 
Other
 
Total
 
 
 
 
 
 
 
Beginning balance, December 31, 2017
 
$
(102,955
)
 
$
33

 
$
(102,922
)
  Other comprehensive income before reclassifications
 
—

 
—

 
—

  Amounts reclassified from accumulated other
  comprehensive loss:
 
 
 
 
 
 
     Actuarial gain (loss), net of tax of $497 (a)
 
1,480

 
—

 
1,480

Net current-period other comprehensive income (loss)
 
1,480

 
—

 
1,480

Ending balance, June 30, 2018
 
$
(101,475
)
 
$
33

 
$
(101,442
)

 
 
Six Months Ended June 30, 2017
(in thousands)
 
Defined Benefit Pension Items
 
Other
 
Total
 
 
 
 
 
 
 
Beginning balance, December 31, 2016
 
$
(93,676
)
 
$
329

 
$
(93,347
)
  Other comprehensive income before reclassifications
 
—

 
—

 
—

  Amounts reclassified from accumulated other
  comprehensive loss:
 
 
 
 
 
 
     Actuarial gain (loss), net of tax of $846 (a)
 
1,390

 
(32
)
 
1,358

Net current-period other comprehensive income (loss)
 
1,390

 
(32
)
 
1,358

Ending balance, June 30, 2017
 
$
(92,286
)
 
$
297

 
$
(91,989
)

(a) Actuarial gain (loss) is included in defined benefit pension plan expense in the condensed consolidated statements of operations