Pensions and Postretirement Benefits Other than Pensions (Tables)

12 Months Ended

Dec. 31, 2011

Pensions and Postretirement Benefits Other than Pensions [Abstract]

Defined benefit pension and other postretirement benefits plans

	2010									2011
	Pension Benefits									Pension Benefits									Other Postretirement Benefits
	Domestic			International			Total			Domestic			International			Total			2010			2011
Change in benefit obligation:
Projected Benefit Obligation at January 1	$	826,458		$	313,659		$	1,140,117		$	865,982		$	320,618		$	1,186,600		$	261,926		$	275,348
Service cost—employer		4,316			2,327			6,643			7,700			2,497			10,197			3,160			3,103
Service cost—employee		—			2,660			2,660			—			2,308			2,308			—			—
Interest cost		45,653			16,923			62,576			45,260			18,009			63,269			14,115			13,846
Amendments		—			(2,260	)		(2,260	)		—			—			—			(8,956	)		—
Actuarial (gain)/loss		53,761			12,729			66,490			54,022			13,846			67,868			15,478			27,928
Benefits paid		(64,206	)		(14,426	)		(78,632	)		(48,420	)		(12,506	)		(60,926	)		(10,375	)		(9,156	)
Foreign currency translation effect		—			(10,994	)		(10,994	)		—			(1,553	)		(1,553	)		—			—
Projected Benefit Obligation at December 31	$	865,982		$	320,618		$	1,186,600		$	924,544		$	343,219		$	1,267,763		$	275,348		$	311,069
Change in plans’ assets:
Fair value of plans’ assets at January 1	$	654,991		$	213,189		$	868,180		$	698,827		$	229,496		$	928,323		$	—		$	—
Actual return on plans’ assets		71,350			27,076			98,426			3,375			30			3,405			—			—
Employer contribution		36,692			8,404			45,096			26,435			8,420			34,855			—			—
Employee contribution		—			2,660			2,660			—			2,308			2,308			—			—
Benefits paid		(64,206	)		(14,426	)		(78,632	)		(48,420	)		(12,506	)		(60,926	)		—			—
Foreign currency translation effect		—			(7,407	)		(7,407	)		—			(834	)		(834	)		—			—
Fair value of plans’ assets at December 31	$	698,827		$	229,496		$	928,323		$	680,217		$	226,914		$	907,131		$	—		$	—
Funded status	$	(167,155	)	$	(91,122	)	$	(258,277	)	$	(244,327	)	$	(116,305	)	$	(360,632	)	$	(275,348	)	$	(311,069	)
Amounts recognized in the balance sheets:
Other assets	$	—		$	44		$	44		$	—		$	—		$	—		$	—		$	—
Accrued liabilities		—			—			—			—			—			—			(17,692	)		(17,802	)
Postretirement benefits other than pensions		—			—			—			—			—			—			(257,657	)		(293,267	)
Pension benefits		(167,155	)		(91,166	)		(258,321	)		(244,327	)		(116,305	)		(360,632	)

Weighted average assumptions used to determine benefit obligations

							Other
	Pension Benefits						Postretirement Benefits
	2010			2011			2010			2011
All plans
Discount rate		5.39	%		4.81	%		5.20	%		4.15	%
Rate of compensation increase		0.92	%		0.81	%		—			—
Domestic plans
Discount rate		5.35	%		4.80	%		5.20	%		4.15	%
Foreign plans
Discount rate		5.50	%		4.85	%		—			—
Rate of compensation increase		3.39	%		2.99	%		—			—

Benefit Pension and Other Postretirement Benefit Cost

	Pension Benefits - Domestic									Pension Benefits - International
	2009			2010			2011			2009			2010			2011
Components of net periodic benefit cost:
Service cost	$	6,532		$	4,316		$	7,700		$	1,852		$	2,327		$	2,497
Interest cost		43,650			45,653			45,260			14,764			16,923			18,009
Expected return on plan assets		(42,001	)		(50,457	)		(50,206	)		(13,580	)		(15,249	)		(16,646	)
Amortization of prior service cost		(874	)		—			—			(177	)		(600	)		(747	)
Amortization of actuarial loss		31,737			27,741			30,300			2,524			5,924			5,772
Spectrum plan freeze		(10,133	)		—			—			—			—			—
Albany curtailment gain		(5,220	)		—			—			—			—			—
Recognized actuarial loss (gain)		9,956			4,323			—			—			(673	)		—
Net periodic benefit cost	$	33,647		$	31,576		$	33,054		$	5,383		$	8,652		$	8,885

	Other Post Retirement Benefits
	2009			2010			2011
Components of net periodic benefit cost:
Service cost	$	3,637		$	3,160		$	3,103
Interest cost		14,765			14,115			13,846
Amortization of prior service cost		(307	)		(542	)		(688	)
Amortization of actuarial loss		—			—			1,261
Net periodic benefit cost	$	18,095		$	16,733		$	17,522

Weighted-average assumptions used to determine net periodic benefit cost

										Other
	Pension Benefits									Postretirement Benefits
	2009			2010			2011			2009			2010			2011
All plans
Discount rate		6.11	%		5.74	%		5.39	%		6.00	%		5.75	%		5.20	%
Expected return on plan assets		8.22	%		8.24	%		7.58	%		—			—			—
Rate of compensation increase		3.32	%		1.03	%		0.92	%		—			—			—
Domestic plans
Discount rate		6.00	%		5.75	%		5.35	%		6.00	%		5.75	%		5.20	%
Expected return on plan assets		8.50	%		8.50	%		7.75	%		—			—			—
Rate of compensation increase		3.25	%		0.00	%		0.00	%		—			—			—
Foreign plans
Discount rate		6.49	%		5.70	%		5.50	%		—			—			—
Expected return on plan assets		7.32	%		7.44	%		7.05	%		—			—			—
Rate of compensation increase		3.55	%		3.74	%		3.39	%		—			—			—

Projected benefit obligation, accumulated benefit obligation and fair value of plan assets for the pension plans

	2010				2011
	Projected benefit obligation exceeds plan assets		Accumulated benefit obligation exceeds plan assets		Projected benefit obligation exceeds plan assets		Accumulated benefit obligation exceeds plan assets
Projected benefit obligation	$	1,184,320	$	1,184,320	$	1,267,763	$	1,267,763
Accumulated benefit obligation		1,181,208		1,181,208		1,264,377		1,264,377
Fair value of plan assets		925,999		925,999		907,131		907,131

One-percentage-point change in assumed health care cost trend rates

	Percentage Point
	Increase		Decrease
Increase (decrease) in total service and interest cost components	$	179	$	(161	)
Increase (decrease) in the postretirement benefit obligation		4,884		(4,139	)

Weighted average asset allocations for domestic and U.K. pension plans' assets

	U.S. Plans						U.K. Plan
Asset Category	2010			2011			2010			2011
Equity securities		57	%		61	%		61	%		56	%
Debt securities		42			37			33			29
Other investments		0			0			5			14
Cash		1			2			1			1
Total		100	%		100	%		100	%		100	%

Assets of U.S and U.K plans using the Fair Value Hierarchy

			Fair Value Heirarchy
	Total		Level 1		Level 2		Level 3
December 31, 2010
United States plans
Cash & Cash Equivalents	$	22,537	$	22,537	$	—	$	—
Equity securities		456,213		171,889		284,324		—
Fixed income securities		220,077		72,984		147,093		—
	$	698,827	$	267,410	$	431,417	$	—
United Kingdom plan
Cash & Cash Equivalents	$	2,854	$	2,854	$	—	$	—
Equity securities		138,141		138,141		—		—
Fixed income securities		75,364		75,364		—		—
Other investments		10,814		—		—		10,814
	$	227,173	$	216,359	$	—	$	10,814
December 31, 2011
United States plans
Cash & Cash Equivalents	$	16,106	$	16,106	$	—	$	—
Equity securities		412,809		168,240		244,569		—
Fixed income securities		251,302		83,274		168,028		—
	$	680,217	$	267,620	$	412,597	$	—
United Kingdom plan
Cash & Cash Equivalents	$	796	$	796	$	—	$	—
Equity securities		126,126		126,126		—		—
Fixed income securities		66,491		66,491		—		—
Other investments		31,213		18,379		—		12,834
	$	224,626	$	211,792	$	—	$	12,834

Details of activity in investment in a European Infrastructure fund

	2010			2011
Balance at January 1	$	9,788		$	10,814
Contributions		1,335			1,668
Disbursements		(166	)		(150	)
Change in fair value		187			538
Foreign currency translation effect		(330	)		(36	)
Balance at December 31	$	10,814		$	12,834

Estimated benefit payments for domestic and foreign pension plans and other postretirement benefit plans

			Other
	Pension		Postretirement
	Benefits		Benefits
2012	$	70,000	$	18,000
2013		70,000		18,000
2014		71,000		18,000
2015		72,000		18,000
2016		73,000		19,000
2017 through 2021		393,000		98,000