Accumulated Other Comprehensive Income (Loss) Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (166,814)	$ (150,364)
OtherComprehensiveIncome(Loss)BeforeReclassifications	(1,527)	1,896
Reclassifications From Accumulated Other Comprehensive Income (Loss)	4,032	3,299
NetCurrentPeriodOtherComprehensive Income (Loss)	2,505	5,195
Accumulated Other Comprehensive Income (Loss), Net of Tax	(164,309)	(145,169)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	12,040	10,057
OtherComprehensiveIncome(Loss)BeforeReclassifications	(1,527)	1,896
Reclassifications From Accumulated Other Comprehensive Income (Loss)	0	0
NetCurrentPeriodOtherComprehensive Income (Loss)	(1,527)	1,896
Accumulated Other Comprehensive Income (Loss), Net of Tax	10,513	11,953
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(178,854)	(160,421)
OtherComprehensiveIncome(Loss)BeforeReclassifications	0	0
Reclassifications From Accumulated Other Comprehensive Income (Loss)	4,032	3,299
NetCurrentPeriodOtherComprehensive Income (Loss)	4,032	3,299
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (174,822)	$ (157,122)