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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Other Comprehensive Income [Abstract] |  |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Changes in AOCI by component for the nine months ended September 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 (losses) arising during the period (a) |  | — |  |  | 5,750 |  |  | (4,380 | ) |  | 1,370 |
Less: Net realized losses reclassified to net income (b) |  | (300 | ) |  | — |  |  | — |  |  | (300 | )
Net current-period other comprehensive income (loss) |  | 300 |  |  | 5,750 |  |  | (4,380 | ) |  | 1,670 |
Reclassification of stranded tax effects |  | (1,260 | ) |  | (10 | ) |  | — |  |  | (1,270 | )
Balance, September 30, 2019 |  | $ | (8,160 | ) |  | $ | 6,680 |  |  | $ | (14,970 | ) |  | $ | (16,450 | )
__________________________
(a) | Derivative instruments, net of income tax of approximately $1.8 million. See Note 10, "Derivative Instruments," for further details.
(b) | Defined benefit plans, net of income tax of approximately $0.1 million. See Note 16, "Defined Benefit Plans," for further details.
| Changes in AOCI by component for the nine months ended September 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) |  | — |  |  | 1,720 |  |  | (6,300 | ) |  | (4,580 | )
Less: Net realized losses reclassified to net income (b) |  | (3,030 | ) |  | — |  |  | — |  |  | (3,030 | )
Net current-period other comprehensive income (loss) |  | 3,030 |  |  | 1,720 |  |  | (6,300 | ) |  | (1,550 | )
Balance, September 30, 2018 |  | $ | (7,420 | ) |  | $ | (1,450 | ) |  | $ | (10,010 | ) |  | $ | (18,880 | )
__________________________
(a) | Derivative instruments, net of income tax of approximately $0.5 million. See Note 10, "Derivative Instruments," for further details.
(b) Defined benefit plans, net of income tax of approximately $0.9 million. See Note 16, "Defined Benefit Plans," for further details.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: 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=118930883&loc=SL7669686-108580 + Details
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