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Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
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, 2016 are summarized as follows, net of tax:
 
 
Defined Benefit Plans
 
 Derivative Instruments
 
Foreign Currency Translation
 
Total
 
 
(dollars in thousands)
Balance, December 31, 2015
 
$
(12,370
)
 
$
(1,790
)
 
$
2,860

 
$
(11,300
)
Net unrealized losses arising during the period (a)
 
—

 
(3,030
)
 
(2,660
)
 
(5,690
)
Less: Net realized losses reclassified to net income (b)
 
(150
)
 
(70
)
 
—

 
(220
)
Net current-period other comprehensive income (loss)
 
150

 
(2,960
)
 
(2,660
)
 
(5,470
)
Balance, March 31, 2016
 
$
(12,220
)
 
$
(4,750
)
 
$
200

 
$
(16,770
)

__________________________
(a) Derivative instruments, net of income tax of approximately $1.9 million. See Note 8, "Derivative Instruments," for further details.
(b) Defined benefit plans, net of income tax of approximately $0.1 million. See Note 13, "Defined Benefit Plans," for further details. Derivative instruments, net of income tax of approximately $0.1 million. See Note 8, "Derivative Instruments," for further details.
Changes in AOCI by component for the three months ended March 31, 2015 are summarized as follows, net of tax:
 
 
Defined Benefit Plans
 
 Derivative Instruments
 
Foreign Currency Translation
 
Total
 
 
(dollars in thousands)
Balance, December 31, 2014
 
$
(14,180
)
 
$
610

 
$
23,790

 
$
10,220

Net unrealized losses arising during the period (a)
 
—

 
(710
)
 
(6,540
)
 
(7,250
)
Less: Net realized losses reclassified to net income (b)
 
(250
)
 
(320
)
 
—

 
(570
)
Net current-period other comprehensive income (loss)
 
250

 
(390
)
 
(6,540
)
 
(6,680
)
Balance, March 31, 2015
 
$
(13,930
)
 
$
220

 
$
17,250

 
$
3,540

__________________________
(a) Derivative instruments, net of income tax of approximately $0.3 million. See Note 8, "Derivative Instruments," for further details.
(b) Defined benefit plans, net of income tax of approximately $0.1 million. See Note 13, "Defined Benefit Plans," for further details. Derivative instruments, net of income tax of approximately $0.1 million. See Note 8, "Derivative Instruments," for further details.