Accumulated Other Comprehensive Income (Loss) Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (162,478)	$ (143,614)	$ (166,814)	$ (150,364)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1,519	2,969	(2,503)	2,987
Reclassifications From Accumulated Other Comprehensive Income (Loss)	4,179	3,365	12,537	10,097
Other Comprehensive Income (Loss), Net of Tax	5,698	6,334	10,034	13,084
Accumulated Other Comprehensive Income (Loss), Net of Tax	(156,780)	(137,280)	(156,780)	(137,280)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	8,018	10,075	12,040	10,057
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1,519	2,969	(2,503)	2,987
Reclassifications From Accumulated Other Comprehensive Income (Loss)	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax	1,519	2,969	(2,503)	2,987
Accumulated Other Comprehensive Income (Loss), Net of Tax	9,537	13,044	9,537	13,044
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(170,496)	(153,689)	(178,854)	(160,421)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0	0	0
Reclassifications From Accumulated Other Comprehensive Income (Loss)	4,179	3,365	12,537	10,097
Other Comprehensive Income (Loss), Net of Tax	4,179	3,365	12,537	10,097
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (166,317)	$ (150,324)	$ (166,317)	$ (150,324)