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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 37,284	$ 41,823	$ 31,184
Other comprehensive income (loss), net of tax:
Change in post-employment benefits	147	66	134
Other	0	(4)	(7)
Other comprehensive income	147	62	127
Comprehensive income	$ 37,431	$ 41,885	$ 31,311

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