CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 1,688	$ 8,122	$ 12,851	$ 8,729
Other comprehensive (loss), net of tax:
Net actuarial pension loss amortization, net of income tax of $0, $0, $0 and $0	0	0	1	0
Prior service cost (credit) amortization, net of income tax of $150, $151, $451 and $452	(238)	(238)	(715)	(714)
Other comprehensive (loss), net of tax	(238)	(238)	(714)	(714)
Comprehensive income	$ 1,450	$ 7,884	$ 12,137	$ 8,015