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Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 7,975	$ 6,393	$ 22,993	$ 14,569
Reclassification of pension and postretirement adjustments into earnings, net of $21 and $45 tax benefit in the three and six months ended June 30, 2019, respectively, net of $26 and $61 tax benefit in the three and six months ended June 30, 2018, respectively.	71	105	172	245
Total other comprehensive income	71	105	172	245
Comprehensive income	$ 8,046	$ 6,498	$ 23,165	$ 14,814

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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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