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Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
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, 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)
 
—

 
(230
)
 
3,730

 
3,500

Less: Net realized losses reclassified to net income (b)
 
(330
)
 
(210
)
 
—

 
(540
)
Net current-period other comprehensive income (loss)
 
330

 
(20
)
 
3,730

 
4,040

Balance, June 30, 2017
 
$
(11,790
)
 
$
(2,540
)
 
$
(6,030
)
 
$
(20,360
)

__________________________
(a) Derivative instruments, net of income tax of approximately $0.1 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 six months ended June 30, 2016 are summarized as follows, net of tax (dollars in thousands):
 
 
Defined Benefit Plans
 
 Derivative Instruments
 
Foreign Currency Translation
 
Total
Balance, December 31, 2015
 
$
(12,370
)
 
$
(1,790
)
 
$
2,860

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

 
(4,420
)
 
(6,740
)
 
(11,160
)
Less: Net realized losses reclassified to net income (b)
 
(300
)
 
(130
)
 
—

 
(430
)
Net current-period other comprehensive income (loss)
 
300

 
(4,290
)
 
(6,740
)
 
(10,730
)
Balance, June 30, 2016
 
$
(12,070
)
 
$
(6,080
)
 
$
(3,880
)
 
$
(22,030
)
__________________________
(a) Derivative instruments, net of income tax of approximately $2.7 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.