Pensions and Postretirement Benefits Other than Pensions (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Components of net periodic benefit cost:
Interest cost	$ 63,269	$ 62,576
Pension Benefit Domestic [Member]
Components of net periodic benefit cost:
Service cost	7,700	4,316	6,532
Interest cost	45,260	45,653	43,650
Expected return on plan assets	(50,206)	(50,457)	(42,001)
Amortization of prior services cost			(874)
Amortization of actuarial loss	30,300	27,741	31,737
Spectrum plan freeze			(10,133)
Albany curtailment gain			(5,220)
Recognized actuarial loss (gain)		4,323	9,956
Net periodic benefit cost	33,054	31,576	33,647
Pension Benefit International [Member]
Components of net periodic benefit cost:
Service cost	2,497	2,327	1,852
Interest cost	18,009	16,923	14,764
Expected return on plan assets	(16,646)	(15,249)	(13,580)
Amortization of prior services cost	(747)	(600)	(177)
Amortization of actuarial loss	5,772	5,924	2,524
Spectrum plan freeze
Albany curtailment gain
Recognized actuarial loss (gain)		(673)
Net periodic benefit cost	8,885	8,652	5,383
Other postretirement benefits [Member]
Components of net periodic benefit cost:
Service cost	3,103	3,160	3,637
Interest cost	13,846	14,115	14,765
Amortization of prior services cost	(688)	(542)	(307)
Amortization of actuarial loss	1,261
Net periodic benefit cost	$ 17,522	$ 16,733	$ 18,095