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Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2017
Other Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income
 
 
Pension Benefit
 
 
2017
 
2016
Amounts Recognized in Accumulated Other Comprehensive Loss
 
 
 
 
Unrecognized prior-service cost
 
$
50

 
$
60

Unrecognized net loss
 
15,600

 
17,910

Total accumulated other comprehensive loss recognized at December 31
 
$
15,650

 
$
17,970

Changes in AOCI by component for the year ended December 31, 2016 are summarized as follows, net of tax (dollars in thousands):
 
 
Defined Benefit Plans
 
 Derivative Instruments
 
Foreign Currency Translation
 
Total
Balance, December 31, 2015
 
$
(12,370
)
 
$
(1,790
)
 
$
2,860

 
$
(11,300
)
Net unrealized losses arising during the period (a)
 
(1,270
)
 
(1,150
)
 
(12,620
)
 
(15,040
)
Less: Net realized losses reclassified to net income (b)
 
(1,520
)
 
(420
)
 
—

 
(1,940
)
Net current-period other comprehensive income (loss)
 
250

 
(730
)
 
(12,620
)
 
(13,100
)
Balance, December 31, 2016
 
$
(12,120
)
 
$
(2,520
)
 
$
(9,760
)
 
$
(24,400
)
__________________________
(a) Defined benefit plans, net of income tax of $0.3 million. See Note 15, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax expense of $0.7 million. See Note 12, "Derivative Instruments," for further details.
(b) Defined benefit plans, net of income tax of $0.7 million. See Note 15, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax expense of $0.3 million. See Note 12, "Derivative Instruments," for further details.
Changes in AOCI by component for the year ended December 31, 2017 are summarized as follows, net of tax (dollars in thousands):
 
 
Defined Benefit Plans
 
 Derivative Instruments
 
Foreign Currency Translation
 
Total
Balance, December 31, 2016
 
$
(12,120
)
 
$
(2,520
)
 
$
(9,760
)
 
$
(24,400
)
Net unrealized gains (losses) arising during the period (a)
 
1,000

 
(3,750
)
 
6,050

 
3,300

Less: Net realized losses reclassified to net income (b)
 
(670
)
 
(3,100
)
 
—

 
(3,770
)
Net current-period other comprehensive income (loss)
 
1,670

 
(650
)
 
6,050

 
7,070

Balance, December 31, 2017
 
$
(10,450
)
 
$
(3,170
)
 
$
(3,710
)
 
$
(17,330
)

__________________________
(a) Defined benefit plans, net of income tax of $0.3 million. See Note 15, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax of $1.3 million. See Note 12, "Derivative Instruments," for further details.
(b) Defined benefit plans, net of income tax of $0.3 million. See Note 15, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax of $1.9 million. See Note 12, "Derivative Instruments," for further details.