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Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Other Comprehensive Income [Abstract] |  |
Schedule of Accumulated Other Comprehensive Income |
|  | Pension Benefit |  | Postretirement Benefit
|  | 2015 |  | 2014 |  | 2015 |  | 2014
|  | (dollars in thousands)
Amounts Recognized in Accumulated Other Comprehensive (Income) Loss |  |  |  |  |  |  |  |
Unrecognized prior-service cost |  | $ | 80 |  |  | $ | 90 |  |  | $ | — |  |  | $ | — |
Unrecognized net loss/(gain) |  | 18,570 |  |  | 21,420 |  |  | (840 | ) |  | (670 | )
Total accumulated other comprehensive (income) loss recognized at December 31 |  | $ | 18,650 |  |  | $ | 21,510 |  |  | $ | (840 | ) |  | $ | (670 | )
Changes in AOCI by component for the year ended December 31, 2015 are summarized as follows, net of tax:
|  | Defined Benefit Plans |  | Derivative Instruments |  | Foreign Currency Translation |  | Total
|  | (dollars in thousands)
Balance, December 31, 2014 |  | $ | (14,180 | ) |  | $ | 610 |  |  | $ | 23,790 |  |  | $ | 10,220 |
Net unrealized losses arising during the period (a) |  | (1,320 | ) |  | (3,610 | ) |  | (12,370 | ) |  | (17,300 | )
Less: Net realized losses reclassified to net income (b) |  | (3,130 | ) |  | (960 | ) |  | — |  |  | (4,090 | )
Net current-period other comprehensive income (loss) |  | 1,810 |  |  | (2,650 | ) |  | (12,370 | ) |  | (13,210 | )
Less: Distribution of the Cequent businesses |  | — |  |  | 250 |  |  | (8,560 | ) |  | (8,310 | )
Balance, December 31, 2015 |  | $ | (12,370 | ) |  | $ | (1,790 | ) |  | $ | 2,860 |  |  | $ | (11,300 | )
__________________________ (a) Defined benefit plans, net of income tax expense of $0.4 million. See Note 16, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax expense of $1.9 million. See Note 13, "Derivative Instruments," for further details. (b) Defined benefit plans, net of income tax expense of $1.8 million. See Note 16, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax expense of $0.3 million. See Note 13, "Derivative Instruments," for further details. | Changes in AOCI by component for the year ended December 31, 2014 are summarized as follows, net of tax:
|  | Defined Benefit Plans |  | Derivative Instruments |  | Foreign Currency Translation |  | Total
|  | (dollars in thousands)
Balance, December 31, 2013 |  | $ | (10,840 | ) |  | $ | 1,060 |  |  | $ | 37,610 |  |  | $ | 27,830 |
Net unrealized losses arising during the period (a) |  | (4,040 | ) |  | (900 | ) |  | (15,090 | ) |  | (20,030 | )
Less: Net realized losses reclassified to net income (b) |  | (700 | ) |  | (450 | ) |  | (1,270 | ) |  | (2,420 | )
Net current-period other comprehensive loss |  | (3,340 | ) |  | (450 | ) |  | (13,820 | ) |  | (17,610 | )
Balance, December 31, 2014 |  | $ | (14,180 | ) |  | $ | 610 |  |  | $ | 23,790 |  |  | $ | 10,220 |
__________________________ (a) Defined benefit plans, net of income tax expense of $2.0 million. See Note 16, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax expense of $0.6 million. See Note 13, "Derivative Instruments," for further details. (b) Defined benefit plans, net of income tax expense of $0.3 million. See Note 16, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax expense of $0.3 million. See Note 13, "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=36458714&loc=SL7669686-108580 + Details
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