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Other Comprehensive Income (Notes)
 12 Months Ended
Dec. 31, 2018
Other Comprehensive Income [Abstract]  
Other Comprehensive Income
Other Comprehensive Income
Changes in AOCI by component for the year ended December 31, 2018 are summarized as follows, net of tax (dollars in thousands):
 
 
Defined Benefit Plans
 
 Derivative Instruments
 
Foreign Currency Translation
 
Total
Balance, December 31, 2017
 
$
(10,450
)
 
$
(3,170
)
 
$
(3,710
)
 
$
(17,330
)
Net unrealized gains (losses) arising during the period (a)
 
—

 
4,110

 
(6,880
)
 
(2,770
)
Less: Net realized losses reclassified to net income (b)
 
(3,250
)
 
—

 
—

 
(3,250
)
Net current-period other comprehensive income (loss)
 
3,250

 
4,110

 
(6,880
)
 
480

Balance, December 31, 2018
 
$
(7,200
)
 
$
940

 
$
(10,590
)
 
$
(16,850
)

__________________________
(a) Derivative instruments, net of income tax of $1.2 million. See Note 11, "Derivative Instruments," for further details.
(b) Defined benefit plans, net of income tax of $0.9 million. See Note 14, "Employee Benefit Plans," for additional 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 14, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax expense of $1.3 million. See Note 11, "Derivative Instruments," for further details.
(b) Defined benefit plans, net of income tax of $0.3 million. See Note 14, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax expense of $1.9 million. See Note 11, "Derivative Instruments," for further details.