CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (11,771)	$ 20,422	$ (10,457)	$ 24,443
OTHER COMPREHENSIVE INCOME, NET OF TAX:
Unrealized gain on available-for-sale securities, net of tax of $11, $6, $4 and $21, respectively	19	25	4	37
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, $52, $258 and $108, respectively	279	142	420	184
Net change for employee benefit plan	279	142	420	184
TOTAL OTHER COMPREHENSIVE INCOME	298	167	424	221
COMPREHENSIVE (LOSS) INCOME	(11,473)	20,589	(10,033)	24,664
Unrealized gain on available-for-sale securities, tax	11	6	4	21
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	$ 52	$ 258	$ 108