CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 34,681	$ 29,516	$ 21,005
Other comprehensive income (loss); change in funded status of pension plan, net of ($1,016), ($2,654) and $3,044 in tax for 2015, 2014 and 2013, respectively	(1,599)	(3,956)	4,542
Comprehensive income	$ 33,082	$ 25,560	$ 25,547