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Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
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, 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 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, 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) |  | — |  |  | (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.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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