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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Other Comprehensive Income [Abstract]    
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Changes in AOCI by component for the three months ended March 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)
 
—

 
(4,040
)
 
2,360

 
(1,680
)
Less: Net realized losses reclassified to net income (b)
 
(200
)
 
—

 
—

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

 
(4,040
)
 
2,360

 
(1,480
)
Balance, March 31, 2018
 
$
(10,250
)
 
$
(7,210
)
 
$
(1,350
)
 
$
(18,810
)

__________________________
(a)  
Derivative instruments, net of income tax of approximately $1.2 million. See Note 9, "Derivative Instruments," for further details.
(b)  
Defined benefit plans, net of income tax of approximately $0.1 million. See Note 14, "Defined Benefit Plans," for further details.
Changes in AOCI by component for the three months ended March 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 arising during the period (a)
 
—

 
240

 
1,800

 
2,040

Less: Net realized losses reclassified to net income (b)
 
(170
)
 
(140
)
 
—

 
(310
)
Net current-period other comprehensive income
 
170

 
380

 
1,800

 
2,350

Balance, March 31, 2017
 
$
(11,950
)
 
$
(2,140
)
 
$
(7,960
)
 
$
(22,050
)
__________________________
(a)  
Derivative instruments, net of income tax of approximately $0.1 million. See Note 9, "Derivative Instruments," for further details.
(b)  
Defined benefit plans, net of income tax of approximately $0.1 million. See Note 14, "Defined Benefit Plans," for further details. Derivative instruments, net of income tax of approximately $0.1 million. See Note 9, "Derivative Instruments," for further details.