Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements of Comprehensive Income
Net income	$ 18,000	$ 13,739	$ 10,557
Other comprehensive income (loss):
Adjustment to defined benefit plan, net of tax	124	(21)	50
Comprehensive income	$ 18,124	$ 13,718	$ 10,607