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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
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, 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) |  | — |  |  | 1,670 |  |  | (4,090 | ) |  | (2,420 | )
Less: Net realized losses reclassified to net income (b) |  | (2,850 | ) |  | — |  |  | — |  |  | (2,850 | )
Net current-period other comprehensive income (loss) |  | 2,850 |  |  | 1,670 |  |  | (4,090 | ) |  | 430 |
Balance, June 30, 2018 |  | $ | (7,600 | ) |  | $ | (1,500 | ) |  | $ | (7,800 | ) |  | $ | (16,900 | )
__________________________
(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 $0.8 million. See Note 14, "Defined Benefit Plans," for further details.
| 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 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.

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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=84228862&loc=SL7669686-108580 + Details
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