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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Other Comprehensive Income [Abstract]    
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Changes in AOCI by component for the nine months ended September 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)
 
—

 
1,720

 
(6,300
)
 
(4,580
)
Less: Net realized losses reclassified to net income (b)
 
(3,030
)
 
—

 
—

 
(3,030
)
Net current-period other comprehensive income (loss)
 
3,030

 
1,720

 
(6,300
)
 
(1,550
)
Balance, September 30, 2018
 
$
(7,420
)
 
$
(1,450
)
 
$
(10,010
)
 
$
(18,880
)

__________________________
(a)  
Derivative instruments, net of income tax of approximately $0.5 million. See Note 9, "Derivative Instruments," for further details.
(b)  
Defined benefit plans, net of income tax of approximately $0.9 million. See Note 14, "Defined Benefit Plans," for further details.
Changes in AOCI by component for the nine months ended September 30, 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)
 
—

 
(580
)
 
4,640

 
4,060

Less: Net realized losses reclassified to net income (b)
 
(500
)
 
(3,100
)
 
—

 
(3,600
)
Net current-period other comprehensive income
 
500

 
2,520

 
4,640

 
7,660

Balance, September 30, 2017
 
$
(11,620
)
 
$
—

 
$
(5,120
)
 
$
(16,740
)
__________________________
(a)  
Derivative instruments, net of income tax of approximately $0.4 million. See Note 9, "Derivative Instruments," for further details.
(b)  
Defined benefit plans, net of income tax of approximately $0.2 million. See Note 14, "Defined Benefit Plans," for further details. Derivative instruments, net of income tax of approximately $1.9 million. See Note 9, "Derivative Instruments," for further details.