Consolidated Statements of Comprehensive (Loss) Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Consolidated Statements of Comprehensive (Loss) Income [Abstract]
NET (LOSS) INCOME	$ (25,056)	$ 26,404	$ (14,787)	$ 40,449
Net unrealized gains on available-for-sale securities:
Net holding gains arising during the period, net of tax expense of $53 and $0 for the three months ended June 30, 2012 and 2011, respectively and $585 and $0 for the six months ended June 30, 2012 and 2011, respectively	434	3,083	1,408	5,028
Reclassification adjustment for net realized losses included in net income, net of tax benefit of $0 for the three and six months ended June 30, 2012 and 2011, respectively		4		4
Total net (losses) gains on available-for-sale securities	434	3,087	1,408	5,032
Pension and postretirement benefit plans:
Reclassification of prior service credit recorded to net income, net of tax expense of $56 and $57 for the three months ended June 30, 2012 and 2011, respectively, and $113 and $114 for the six months ended June 30, 2012 and 2011, respectively	(93)	(92)	(185)	(185)
Reclassification of net actuarial loss recorded to net income, net of tax benefit of $595 and $620, for the three months ended June 30, 2012 and 2011, respectively, and $1,191 and $1,242 for the six months ended June 30, 2012 and 2011, respectively	972	1,012	1,944	2,024
Unrealized foreign currency translation (losses) gains, net of tax (benefit) expense of $(1,127) and $205 for the three months ended June 30, 2012 and 2011, respectively, and $125 and $648 for the six months ended June 30, 2012 and 2011, respectively	(1,839)	334	204	1,058
Other comprehensive (loss) income	(526)	4,341	3,371	7,929
COMPREHENSIVE (LOSS) INCOME	$ (25,582)	$ 30,745	$ (11,416)	$ 48,378