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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Other Comprehensive Income [Abstract]    
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Changes in AOCI by component for the six months ended June 30, 2019 are summarized as follows, net of tax (dollars in thousands):
 
 
Defined Benefit Plans
 
 Derivative Instruments
 
Foreign Currency Translation
 
Total
Balance, December 31, 2018
 
$
(7,200
)
 
$
940

 
$
(10,590
)
 
$
(16,850
)
Net unrealized gains (losses) arising during the period (a)
 
—

 
1,490

 
(200
)
 
1,290

Less: Net realized losses reclassified to net income (b)
 
(200
)
 
—

 
—

 
(200
)
Net current-period other comprehensive income (loss)
 
200

 
1,490

 
(200
)
 
1,490

Reclassification of stranded tax effects
 
(1,260
)
 
(10
)
 
—

 
(1,270
)
Balance, June 30, 2019
 
$
(8,260
)
 
$
2,420

 
$
(10,790
)
 
$
(16,630
)

__________________________
(a)  
Derivative instruments, net of income tax of approximately $0.5 million. See Note 10, "Derivative Instruments," for further details.
(b)  
Defined benefit plans, net of income tax of approximately $0.1 million. See Note 16, "Defined Benefit Plans," for further details.
Changes in AOCI by component for the six months ended June 30, 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)
 
—

 
1,670

 
(4,090
)
 
(2,420
)
Less: Net realized losses reclassified to net income (b)
 
(2,850
)
 
—

 
—

 
(2,850
)
Net current-period other comprehensive income (loss)
 
2,850

 
1,670

 
(4,090
)
 
430

Balance, June 30, 2018
 
$
(7,600
)
 
$
(1,500
)
 
$
(7,800
)
 
$
(16,900
)
__________________________
(a)  
Derivative instruments, net of income tax of approximately $0.5 million. See Note 10, "Derivative Instruments," for further details.
(b)  
Defined benefit plans, net of income tax of approximately $0.8 million. See Note 16, "Defined Benefit Plans," for further details.