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STOCKHOLDERS' EQUITY (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Changes in Common Stock Outstanding
The following table demonstrates the change in the number of shares of common stock outstanding during the years ended December 2018, 2017, and 2016 (excludes non-voting restricted shares).
Shares outstanding as of December 31, 2015
47,828,079

Purchase of common stock
(123,577
)
Shares issued under stock incentive plan, net of awards surrendered to pay applicable taxes
192,050

Exercise of stock options
202,500

Shares issued to Board of Directors in lieu of cash
3,276

Shares outstanding as of December 31, 2016
48,102,328

Purchase of common stock
(17,445
)
Shares issued under stock incentive plan, net of awards surrendered to pay applicable taxes
385,037

Exercise of stock options
22,500

Shares issued to Board of Directors in lieu of cash
5,522

Shares outstanding as of December 31, 2017
48,497,942

Shares issued under stock incentive plan, net of awards surrendered to pay applicable taxes
204,855

Shares issued to Board of Directors in lieu of cash
3,129

Shares outstanding as of December 31, 2018
48,705,926
Schedule of Components of Accumulated Other Comprehensive Income (Loss)
The components of accumulated other comprehensive income (loss) are as follows (in thousands):
 
Beginning
Balance
 
Before-Tax
Amount
 
Tax Benefit
(Expense)
 
Net-of-Tax
Amount
 
ASU 2018-02
 
Ending
Balance
December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
Pension and other post-employment liability adjustment
$
(22,832
)
 
$
(10,785
)
 
$
4,212

 
$
(6,573
)
 
$
—

 
$
(29,405
)
Foreign currency translation adjustment
(14,486
)
 
488

 
—

 
488

 
—

 
(13,998
)
Accumulated other comprehensive income (loss)
$
(37,318
)
 
$
(10,297
)
 
$
4,212

 
$
(6,085
)
 
$
—

 
$
(43,403
)
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
Pension and other post-employment liability adjustment
$
(29,405
)
 
$
(9,783
)
 
$
1,025

 
$
(8,758
)
 
$
—

 
$
(38,163
)
Foreign currency translation adjustment
(13,998
)
 
8,387

 
—

 
8,387

 
—

 
(5,611
)
Accumulated other comprehensive income (loss)
$
(43,403
)
 
$
(1,396
)
 
$
1,025

 
$
(371
)
 
$
—

 
$
(43,774
)
December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
Pension and other post-employment liability adjustment
$
(38,163
)
 
$
3,575

 
$
(930
)
 
$
2,645

 
$
(4,761
)
 
$
(40,279
)
Interest rate swap derivative
—

 
(1,689
)
 
439

 
(1,250
)
 
—

 
(1,250
)
Foreign currency translation adjustment
(5,611
)
 
(13,140
)
 
—

 
(13,140
)
 
—

 
(18,751
)
Foreign currency translation adjustment on long-term intercompany notes
—

 
(8,114
)
 
—

 
(8,114
)
 
—

 
(8,114
)
Accumulated other comprehensive income (loss)
$
(43,774
)

$
(19,368
)

$
(491
)

$
(19,859
)

$
(4,761
)
 
$
(68,394
)
Schedule of Reclassifications Made From Accumulated Other Comprehensive Income (Loss) to the statement of Operations
The following reclassifications were made from accumulated other comprehensive income (loss) to the statements of operations (in thousands):
 
December 31,
 
2018
 
2017
 
2016
Amortization of pension and other post-employment liability adjustments
 
 
 
 
 
Prior service credits (1)
$
730

 
$
1,485

 
$
1,120

Actuarial losses (1)
(917
)
 
(707
)
 
(244
)
Loss recognized during settlement
(5,735
)
 
(2,162
)
 
—

Total before tax
(5,922
)
 
(1,384
)

876

Tax (benefit) expense
(1,502
)
 
(548
)
 
312

Net of tax
$
(4,420
)
 
$
(836
)

$
564

(1) These accumulated other comprehensive income (loss) components are included in the computation of net periodic pension costs. See Note 10 for additional information.