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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Notes) | 6 Months Ended
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Jun. 30, 2018
Other Comprehensive Income [Abstract] |
Comprehensive Income (Loss) Note [Text Block] | Other Comprehensive Income (Loss) 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 Other Comprehensive [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration