CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (156)	$ 4,190	$ 417,441	$ 4,410
Other comprehensive (loss) income:
Net unrealized losses	(3,202)	(693)	(3,480)	(1,584)
Reclassification of other-than-temporary impairment losses included in earnings	1,295	0	1,295	0
Reclassification of realized (gains) losses included in earnings	0	(93)	833	(93)
Income tax benefit	734	0	519	0
Total	(1,173)	(786)	(833)	(1,677)
Defined benefit pension items:
Net gain (loss) arising during the period	94	87	(502)	2,100
Settlement included in net periodic cost	529	212	969	606
Amortization of loss included in net periodic cost	115	50	373	248
Income tax expense	(284)	0	(324)	0
Total	454	349	516	2,954
Total other comprehensive (loss) income, net of tax	(719)	(437)	(317)	1,277
Total comprehensive (loss) income, net of tax	$ (875)	$ 3,753	$ 417,124	$ 5,687