Employee Benefit Plans (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
U. S. Plans
Defined benefit plans:
Service cost	$ 1,557	$ 2,086	$ 1,790
Interest cost	13,468	14,049	14,104
Expected return on plan assets	(16,480)	(16,632)	(14,598)
Recognized prior service costs	245	339	351
Recognized losses	2,982	2,537	3,466
Settlement/curtailment loss (gain)		179	4
Defined benefit plans pension cost	1,772	2,558	5,117
Multiemployer plans	13,264	10,924	12,533
Defined contribution plans	5,434	5,918	7,104
Net periodic pension cost	20,470	19,400	24,754
Change in benefit obligation:
Benefit obligation at beginning of year	264,969	247,263
Service cost	1,557	2,086	1,790
Interest cost	13,468	14,049	14,104
Amendments		6
Actuarial loss	40,730	22,397
Benefit Obligation at end of year	298,769	264,969	247,263
Change in plan assets:
Fair value at the beginning of the period	221,673	216,919
Actual return on plan assets	6,464	23,279
Employer contributions	3,055	2,307
Benefits paid	(21,955)	(20,832)
Fair value at the end of the period	209,237	221,673	216,919
Funded status at end of year	(89,532)	(43,296)
International Plans
Defined benefit plans:
Service cost	4,350	4,052	3,977
Interest cost	48,768	47,558	42,854
Expected return on plan assets	(52,735)	(46,079)	(41,453)
Recognized prior service costs	424	327	353
Recognized losses	11,332	12,077	9,353
Amortization of transition liability	43	45	33
Settlement/curtailment loss (gain)	183	(210)	(341)
Defined benefit plans pension cost	12,365	17,770	14,776
Multiemployer plans	13,326	12,065	9,201
Defined contribution plans	7,378	7,629	8,235
Net periodic pension cost	33,069	37,464	32,212
Change in benefit obligation:
Benefit obligation at beginning of year	883,342	887,882
Service cost	4,350	4,052	3,977
Interest cost	48,768	47,558	42,854
Plan participants' contributions	986	1,862
Amendments	598	653
Actuarial loss	79,474	11,464
Settlements/curtailments	(1,886)	(1,410)
Benefits paid	(37,653)	(39,258)
Effect of foreign currency	(10,332)	(29,461)
Other	571
Benefit Obligation at end of year	968,218	883,342	887,882
Change in plan assets:
Fair value at the beginning of the period	708,025	679,018
Actual return on plan assets	19,488	71,783
Employer contributions	29,300	16,868
Plan participants' contributions	986	1,862
Settlements/curtailments	(1,127)	(929)
Benefits paid	(36,631)	(38,764)
Effect of foreign currency	(6,449)	(21,813)
Other	571
Fair value at the end of the period	714,163	708,025	679,018
Funded status at end of year	$ (254,055)	$ (175,317)