Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income or Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance					$ (11,450)		$ (57,808)
Other comprehensive income before reclassifications					(25,536)		4,896
Actuarial net gain (loss) incurred in the fiscal period	0		0		0		17,225
Amounts reclassified from accumulated other comprehensive income					605		3,107
Net current-period other comprehensive income					(24,931)		25,228
Ending balance	(36,381)		(32,580)		(36,381)		(32,580)
AOCI, Pension and other postretirement benefit plans, tax	2,688		11,423		2,688		11,423		2,900	22,371
AOCI, Cumulative changes in net gain (loss) from cash flow hedges, tax	61		116		61		116		110	127
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance					22,756		12,585
Other comprehensive income before reclassifications					(25,421)		4,877
Actuarial net gain (loss) incurred in the fiscal period					0		0
Amounts reclassified from accumulated other comprehensive income					0		0
Net current-period other comprehensive income					(25,421)		4,877
Ending balance	(2,665)		17,462		(2,665)		17,462
Funded status of pension plans and other postretirement benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance					(33,997)	[1]	(70,158)	[2]
Other comprehensive income before reclassifications					0	[1]	0	[2]
Actuarial net gain (loss) incurred in the fiscal period					0	[1]	17,225	[2]
Amounts reclassified from accumulated other comprehensive income					395	[1]	3,107	[2]
Net current-period other comprehensive income					395	[1]	20,332	[2]
Ending balance	(33,602)	[1]	(49,826)	[2]	(33,602)	[1]	(49,826)	[2]
Unrealized gain (loss) on derivative instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance					(209)	[3]	(235)	[4]
Other comprehensive income before reclassifications					(115)	[3]	19	[4]
Actuarial net gain (loss) incurred in the fiscal period					0	[3]	0	[4]
Amounts reclassified from accumulated other comprehensive income					210	[3]	0	[4]
Net current-period other comprehensive income					95	[3]	19	[4]
Ending balance	$ (114)	[3]	$ (216)	[4]	$ (114)	[3]	$ (216)	[4]

[1] Net of taxes of $2,688 and $2,900 for the periods ended September 30, 2014 and December 31, 2013, respectively.

[2] Net of taxes of $11,423 and $22,371 for the periods ended September 30, 2013 and December 31, 2012, respectively.

[3] Net of taxes of $61 and $110 for the periods ended September 30, 2014 and December 31, 2013, respectively.

[4] Net of taxes of $116 and $127 for the periods ended September 30, 2013 and December 31, 2012, respectively.