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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
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, 2020 are summarized as follows, net of tax (dollars in thousands):
|  | Defined Benefit Plans |  | Derivative Instruments |  | Foreign Currency Translation |  | Total
Balance, December 31, 2019 |  | $ | (9,930 | ) |  | $ | 4,230 |  |  | $ | (300 | ) |  | $ | (6,000 | )
Net unrealized gains (losses) arising during the period (a) |  | — |  |  | 2,300 |  |  | (6,950 | ) |  | (4,650 | )
Less: Net realized losses reclassified to net income (b) |  | (310 | ) |  | — |  |  | — |  |  | (310 | )
Net current-period other comprehensive income (loss) |  | 310 |  |  | 2,300 |  |  | (6,950 | ) |  | (4,340 | )
Balance, June 30, 2020 |  | $ | (9,620 | ) |  | $ | 6,530 |  |  | $ | (7,250 | ) |  | $ | (10,340 | )
__________________________
(a) | Derivative instruments, net of income tax of approximately $0.8 million. See Note 11, "Derivative Instruments," for further details.
(b) | Defined benefit plans, net of income tax of approximately $0.1 million. See Note 18, "Defined Benefit Plans," for further details.
| Changes in AOCI by component for the six months ended June 30, 2019 are summarized as follows, net of tax (dollars in thousands):
|  | Defined Benefit Plans |  | Derivative Instruments |  | Foreign Currency Translation |  | Total
Balance, December 31, 2018 |  | $ | (7,200 | ) |  | $ | 940 |  |  | $ | (10,590 | ) |  | $ | (16,850 | )
Net unrealized gains arising during the period (a) |  | — |  |  | 1,490 |  |  | (200 | ) |  | 1,290 |
Less: Net realized losses reclassified to net income (b) |  | (200 | ) |  | — |  |  | — |  |  | (200 | )
Net current-period other comprehensive income (loss) |  | 200 |  |  | 1,490 |  |  | (200 | ) |  | 1,490 |
Reclassification of stranded tax effects |  | (1,260 | ) |  | (10 | ) |  | — |  |  | (1,270 | )
Balance, June 30, 2019 |  | $ | (8,260 | ) |  | $ | 2,420 |  |  | $ | (10,790 | ) |  | $ | (16,630 | )
__________________________ (a) Derivative instruments, net of income tax of approximately $0.5 million. See Note 11, "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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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