Condensed Consolidating Financial Statements (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
CONDENSED, CONSOLIDATING STATEMENTS OF COMPREHENSIVE (LOSS) INCOME
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
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
Parent [Member]
CONDENSED, CONSOLIDATING STATEMENTS OF COMPREHENSIVE (LOSS) INCOME
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
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
Subsidiary Guarantors [Member]
CONDENSED, CONSOLIDATING STATEMENTS OF COMPREHENSIVE (LOSS) INCOME
NET (LOSS) INCOME	(19,427)	30,978	(8,010)	45,669
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
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)	471	204	1,520
Other comprehensive (loss) income	(526)	4,478	3,371	8,391
COMPREHENSIVE (LOSS) INCOME	(19,953)	35,456	(4,639)	54,060
Non-Guarantors [Member]
CONDENSED, CONSOLIDATING STATEMENTS OF COMPREHENSIVE (LOSS) INCOME
NET (LOSS) INCOME	(5,281)	(2,022)	(6,733)	5,053
Pension and postretirement benefit plans:
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	(1,506)	182	(444)	551
Other comprehensive (loss) income	(1,506)	182	(444)	551
COMPREHENSIVE (LOSS) INCOME	(6,787)	(1,840)	(7,177)	5,604
Eliminations [Member]
CONDENSED, CONSOLIDATING STATEMENTS OF COMPREHENSIVE (LOSS) INCOME
NET (LOSS) INCOME	24,708	(28,956)	14,743	(50,722)
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)
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	3,345	(653)	240	(2,071)
Other comprehensive (loss) income	2,032	(4,660)	(2,927)	(8,942)
COMPREHENSIVE (LOSS) INCOME	$ 26,740	$ (33,616)	$ 11,816	$ (59,664)