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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 38,793	$ 37,284	$ 41,823
Other comprehensive income (loss), net of tax:
Change in post-employment benefits	(151)	147	66
Other	0	0	(4)
Other comprehensive income (loss)	(151)	147	62
Comprehensive income	$ 38,642	$ 37,431	$ 41,885

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