CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net income	$ 74,052	$ 9,660	$ 3,155
OTHER COMPREHENSIVE (LOSS) INCOME, NET OF TAX:
Unrealized loss on available-for-sale securities	(6)	(31)	(1)
Employee benefit plan:
Actuarial gain (loss) on retirement plan	901	(442)	(418)
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs	439	628	600
Net change for employee benefit plan	1,340	186	182
TOTAL OTHER COMPREHENSIVE INCOME	1,334	155	181
COMPREHENSIVE INCOME	$ 75,386	$ 9,815	$ 3,336