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Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2017
Other Comprehensive Income [Abstract] |
Schedule of Accumulated Other Comprehensive Income |
|  | Pension Benefit
|  | 2017 |  | 2016
Amounts Recognized in Accumulated Other Comprehensive Loss |  |  |  |
Unrecognized prior-service cost |  | $ | 50 |  |  | $ | 60 |
Unrecognized net loss |  | 15,600 |  |  | 17,910 |
Total accumulated other comprehensive loss recognized at December 31 |  | $ | 15,650 |  |  | $ | 17,970 |
Changes in AOCI by component for the year ended December 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) |  | (1,270 | ) |  | (1,150 | ) |  | (12,620 | ) |  | (15,040 | )
Less: Net realized losses reclassified to net income (b) |  | (1,520 | ) |  | (420 | ) |  | — |  |  | (1,940 | )
Net current-period other comprehensive income (loss) |  | 250 |  |  | (730 | ) |  | (12,620 | ) |  | (13,100 | )
Balance, December 31, 2016 |  | $ | (12,120 | ) |  | $ | (2,520 | ) |  | $ | (9,760 | ) |  | $ | (24,400 | )
__________________________ (a) Defined benefit plans, net of income tax of $0.3 million. See Note 15, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax expense of $0.7 million. See Note 12, "Derivative Instruments," for further details. (b) Defined benefit plans, net of income tax of $0.7 million. See Note 15, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax expense of $0.3 million. See Note 12, "Derivative Instruments," for further details. Changes in AOCI by component for the year ended December 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 (losses) arising during the period (a) |  | 1,000 |  |  | (3,750 | ) |  | 6,050 |  |  | 3,300 |
Less: Net realized losses reclassified to net income (b) |  | (670 | ) |  | (3,100 | ) |  | — |  |  | (3,770 | )
Net current-period other comprehensive income (loss) |  | 1,670 |  |  | (650 | ) |  | 6,050 |  |  | 7,070 |
Balance, December 31, 2017 |  | $ | (10,450 | ) |  | $ | (3,170 | ) |  | $ | (3,710 | ) |  | $ | (17,330 | )
__________________________ (a) Defined benefit plans, net of income tax of $0.3 million. See Note 15, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax of $1.3 million. See Note 12, "Derivative Instruments," for further details. (b) Defined benefit plans, net of income tax of $0.3 million. See Note 15, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax of $1.9 million. See Note 12, "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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