CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (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 (loss) income	$ 7,047	$ 4,284	$ (3,410)	$ 28,728
OTHER COMPREHENSIVE INCOME, NET OF TAX:
Unrealized (loss) gain on available-for-sale securities, net of tax of $2, $9, $(6) and $10, respectively	(5)	(19)	(9)	20
Employee benefit plan:
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, net of tax of $157, $54, $401 and $162, respectively	279	92	713	275
Net change for employee benefit plan	279	92	713	275
TOTAL OTHER COMPREHENSIVE INCOME	274	73	704	295
COMPREHENSIVE INCOME (LOSS)	7,321	4,357	(2,706)	29,023
Unrealized gain on available-for-sale securities, tax	2	9	(6)	10
Actuarial gain on retirement plan, tax	0	0	0	0
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, tax	$ 157	$ 54	$ 401	$ 162