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Accumulated Other Comprehensive Income (Loss) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) Changes in accumulated other comprehensive income (loss) by component, net of tax, were as follows:
(In thousands) | Postretirement Benefits
Balance at December 31, 2014 | $ | (2,151 | )
Other comprehensive income (loss) before reclassifications | 1,786 |
Net current-period other comprehensive income (loss) | 1,786 |
Balance at December 31, 2015 | $ | (365 | )
Other comprehensive income (loss) before reclassifications | 1,280 |
Amounts reclassified from accumulated other comprehensive income (loss) | 70 |
Net current-period other comprehensive income | 1,350 |
Balance at December 31, 2016 | $ | 985 |
Other comprehensive income (loss) before reclassifications | 2,815 |
Amounts reclassified from accumulated other comprehensive income (loss) | (1,723 | )
Net current-period other comprehensive income | 1,092 |
Balance at December 31, 2017 | $ | 2,077 |
Amounts reclassified from accumulated other comprehensive income (loss) into the Consolidated Statement of Operations were as follows:
| Year Ended December 31, |  | Affected Line Item in the Consolidated Statement of Operations
(In thousands) | 2017 |  | 2016 |  | 2015 |
Postretirement benefits |  |  |  |  |  |  |  |  |  |
Amortization of prior service cost | 2,733 |  |  | (111 | ) |  | — |  |  | General and administrative expense
Total before tax | 2,733 |  |  | (111 | ) |  | — |  |  | Income (loss) before income taxes
| (1,010 | ) |  | 41 |  |  | — |  |  | Income tax benefit (expense)
Total reclassifications for the period | $ | 1,723 |  |  | $ | (70 | ) |  | $ | — |  |  | Net income (loss)

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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

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration