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OTHER COMPREHENSIVE INCOME (LOSS) (Tables)
 12 Months Ended
Dec. 31, 2019
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Reclassification adjustments Information regarding amounts reclassified from accumulated other comprehensive loss to net (loss) income was as follows:
Accumulated other comprehensive loss components
 
Amounts reclassified from accumulated other comprehensive loss
 
Affected line item in consolidated statements of (loss) income
(in thousands)
 
2019
 
2018
 
2017
 
 
Realized gains on interest rate swap
 
$
77

 
$
—

 
$
—

 
Interest expense
Tax expense
 
(20
)
 
—

 
—

 
Income tax provision
Realized gains on interest rate swap, net of tax
 
57

 
—

 
—

 
Net (loss) income
Amortization of postretirement benefit plan items:
 
 
 
 
 
 
 
 
Prior service credit
 
1,421

 
1,421

 
1,421

 
Other income
Net actuarial loss
 
(3,223
)
 
(2,884
)
 
(3,637
)
 
Other income
Total amortization
 
(1,802
)
 
(1,463
)
 
(2,216
)
 
Other income
Tax benefit
 
273

 
491

 
372

 
Income tax provision
Amortization of postretirement benefit plan items, net of tax
 
(1,529
)
 
(972
)
 
(1,844
)
 
Net (loss) income
Total reclassifications, net of tax
 
$
(1,472
)
 
$
(972
)
 
$
(1,844
)
 
 
Accumulated other comprehensive loss Changes in the components of accumulated other comprehensive loss were as follows for the years ended December 31:
(in thousands)
 
Postretirement benefit plans
 
Net unrealized loss on marketable debt securities
 
Net unrealized loss on cash flow hedge
 
Currency translation adjustment
 
Accumulated other comprehensive loss
Balance, December 31, 2016
 
$
(35,684
)
 
$
(213
)
 
$
—

 
$
(14,474
)
 
$
(50,371
)
Other comprehensive income (loss) before reclassifications
 
7,011

 
(109
)
 
—

 
4,028

 
10,930

Amounts reclassified from accumulated other comprehensive loss
 
1,844

 
—

 
—

 
—

 
1,844

Net current-period other comprehensive income (loss)
 
8,855

 
(109
)
 
—

 
4,028

 
12,774

Balance, December 31, 2017
 
(26,829
)
 
(322
)
 
—

 
(10,446
)
 
(37,597
)
Other comprehensive loss before reclassifications
 
(3,805
)
 
(1
)
 
—

 
(9,281
)
 
(13,087
)
Amounts reclassified from accumulated other comprehensive loss
 
972

 
—

 
—

 
—

 
972

Net current-period other comprehensive loss
 
(2,833
)
 
(1
)
 
—

 
(9,281
)
 
(12,115
)
Adoption of ASU No. 2018-02
 
(6,867
)
 
—

 
—

 
—

 
(6,867
)
Balance, December 31, 2018
 
(36,529
)
 
(323
)
 
—

 
(19,727
)
 
(56,579
)
Other comprehensive income (loss) before reclassifications
 
6,594

 
48

 
(1,040
)
 
1,558

 
7,160

Amounts reclassified from accumulated other comprehensive loss
 
1,529

 
—

 
(57
)
 
—

 
1,472

Net current-period other comprehensive income (loss)
 
8,123

 
48

 
(1,097
)
 
1,558

 
8,632

Balance, December 31, 2019
 
$
(28,406
)
 
$
(275
)
 
$
(1,097
)
 
$
(18,169
)
 
$
(47,947
)