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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net (loss) income	$ (22,562)	$ 12,324	$ 31,805
Other comprehensive income (loss) net of tax:
Pension liability adjustments, net of tax	734	43	154
Postretirement liability adjustments, net of tax	(138)	12,872	2,785
Other comprehensive income	596	12,915	2,939
Comprehensive (loss) income	$ (21,966)	$ 25,239	$ 34,744

X

- Definition

The adjustment out of other comprehensive income for prior service costs recognized as a component of net period benefit cost during the period, after tax. Also includes actuarial gains/losses recognized out of OCI in addition to prior service costs. This is the portion attributable to the pension liability.

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- Definition

The adjustment out of other comprehensive income for prior service costs recognized as a component of net period benefit cost during the period, after tax. Also includes actuarial gains/losses recognized out of OCI in addition to prior service costs. This is the portion attributable to the postretirement benefits liability.

+ References

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- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=51831270

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=51831223

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=51831255

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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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