Employee Benefit Plans (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Multi-employer pension plans
Contributions to multi-employer pension plans	$ 5,286,000	$ 5,394,000	$ 19,425,000	$ 16,446,000
Defined contribution pension plans
Contributions to defined contribution pension plans	4,244,000	4,659,000	10,064,000	10,339,000
U. S. Plans
Defined benefit plans:
Service cost	391,000	518,000	1,174,000	1,558,000
Interest cost	3,381,000	3,500,000	10,151,000	10,522,000
Expected return on plan assets	(4,138,000)	(4,146,000)	(12,423,000)	(12,463,000)
Recognized prior service costs	62,000	84,000	186,000	254,000
Recognized losses	749,000	650,000	2,248,000	1,954,000
Settlement loss		179,000		179,000
Defined benefit plans net periodic pension cost	445,000	785,000	1,336,000	2,004,000
Contributions by employer to defined benefit pension plan	1,459,000	453,000	2,466,000	1,346,000
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	600,000		600,000
International Plans
Defined benefit plans:
Service cost	1,120,000	1,009,000	3,359,000	2,999,000
Interest cost	12,166,000	11,925,000	36,469,000	35,129,000
Expected return on plan assets	(13,138,000)	(11,567,000)	(39,386,000)	(34,059,000)
Recognized prior service costs	107,000	90,000	320,000	269,000
Recognized losses	2,817,000	3,023,000	8,443,000	8,897,000
Amortization of transition liability	14,000	14,000	43,000	41,000
Settlement loss		17,000	30,000	50,000
Defined benefit plans net periodic pension cost	3,086,000	4,511,000	9,278,000	13,326,000
Contributions by employer to defined benefit pension plan	6,279,000	3,547,000	27,196,000	13,268,000
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	$ 2,200,000		$ 2,200,000