Accumulated Other Comprehensive Income (Loss) Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (164,309)	$ (145,169)	$ (166,814)	$ (150,364)
OtherComprehensiveIncome(Loss)BeforeReclassifications	(2,495)	(1,878)	(4,022)	18
Reclassifications From Accumulated Other Comprehensive Income (Loss)	4,326	3,433	8,358	6,732
NetCurrentPeriodOtherComprehensive Income (Loss)	1,831	1,555	4,336	6,750
Accumulated Other Comprehensive Income (Loss), Net of Tax	(162,478)	(143,614)	(162,478)	(143,614)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	10,513	11,953	12,040	10,057
OtherComprehensiveIncome(Loss)BeforeReclassifications	(2,495)	(1,878)	(4,022)	18
Reclassifications From Accumulated Other Comprehensive Income (Loss)	0	0	0	0
NetCurrentPeriodOtherComprehensive Income (Loss)	(2,495)	(1,878)	(4,022)	18
Accumulated Other Comprehensive Income (Loss), Net of Tax	8,018	10,075	8,018	10,075
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(174,822)	(157,122)	(178,854)	(160,421)
OtherComprehensiveIncome(Loss)BeforeReclassifications	0	0	0	0
Reclassifications From Accumulated Other Comprehensive Income (Loss)	4,326	3,433	8,358	6,732
NetCurrentPeriodOtherComprehensive Income (Loss)	4,326	3,433	8,358	6,732
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (170,496)	$ (153,689)	$ (170,496)	$ (153,689)