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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 12,200	$ 11,389
Defined benefit pension plans
Amortization of actuarial (gain) loss, net of tax of $51 and ($11), respectively	151	(32)
Effect of settlements, net of tax of $22 and $-, respectively	64	0
Other comprehensive income (loss), net of tax	215	(32)
Comprehensive income	$ 12,415	$ 11,357

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