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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Summary of Changes in Accumulated Other Comprehensive Loss by Component | Changes in accumulated other comprehensive loss by component for the nine months ended September 30, 2018 and 2017 consisted of the following (in thousands):
|  |  |  |  | Other-Than- |  |  |
|  | Minimum |  | Temporary |  |  |
|  | Pension |  | Impairment of |  |  |
|  | Liability |  | Investment |  | Total
Balance, December 31, 2017 |  | $ | (20,149) |  | $ | (6,543) |  | $ | (26,692)
Amounts reclassified from accumulated other comprehensive loss |  |  | 4,429 |  |  | 249 |  |  | 4,678
Income tax expense |  |  | (1,077) |  |  | — |  |  | (1,077)
Net other comprehensive income |  |  | 3,352 |  |  | 249 |  |  | 3,601
Balance, September 30, 2018 |  | $ | (16,797) |  | $ | (6,294) |  | $ | (23,091)
|  |  |  |  | Other-Than- |  |  |
|  | Minimum |  | Temporary |  |  |
|  | Pension |  | Impairment of |  |  |
|  | Liability |  | Investment |  | Total
Balance, December 31, 2016 |  | $ | (22,268) |  | $ | — |  | $ | (22,268)
Amounts reclassified from accumulated other comprehensive loss |  |  | 1,609 |  |  | — |  |  | 1,609
Income tax benefit |  |  | — |  |  | — |  |  | —
Net other comprehensive income |  |  | 1,609 |  |  | — |  |  | 1,609
Balance, September 30, 2017 |  | $ | (20,659) |  | $ | — |  | $ | (20,659)

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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=114867106&loc=SL7669686-108580 + Details
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