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Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 15,018	$ 8,176
Reclassification of pension and postretirement adjustments into earnings, net of $24 and $35 tax benefit in the three months ended March 31, 2019 and March 31, 2018, respectively.	101	140
Total other comprehensive income	101	140
Comprehensive income	$ 15,119	$ 8,316

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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.

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