Employee Benefit Plans (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Multi-employer pension plans
Contributions to multi-employer pension plans	$ 8,200,000		$ 14,100,000
Defined contribution pension plans
Contributions to defined contribution pension plans	3,200,000		5,800,000
U. S. Plans
Defined benefit plans:
Service cost	391,000	520,000	783,000	1,040,000
Interest cost	3,381,000	3,512,000	6,770,000	7,022,000
Expected return on plan assets	(4,138,000)	(4,158,000)	(8,285,000)	(8,317,000)
Recognized prior service costs	62,000	85,000	124,000	170,000
Recognized losses	749,000	652,000	1,499,000	1,304,000
Defined benefit plans net periodic pension cost	445,000	611,000	891,000	1,219,000
Contributions by employer to defined benefit pension plan	600,000		1,000,000
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	2,000,000		2,000,000
International Plans
Defined benefit plans:
Service cost	1,144,000	970,000	2,239,000	1,991,000
Interest cost	12,320,000	11,383,000	24,303,000	23,204,000
Expected return on plan assets	(13,715,000)	(11,045,000)	(26,248,000)	(22,491,000)
Recognized prior service costs	110,000	87,000	213,000	179,000
Recognized losses	2,849,000	2,885,000	5,627,000	5,873,000
Amortization of transition liability	15,000	13,000	29,000	26,000
Settlement loss		17,000	30,000	33,000
Defined benefit plans net periodic pension cost	2,723,000	4,310,000	6,193,000	8,815,000
Contributions by employer to defined benefit pension plan	4,000,000		20,900,000
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	$ 8,500,000		$ 8,500,000