Employee Benefit Plans (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Defined benefit plans:
Multiemployer pension plans	$ 4,479,000	$ 6,281,000	$ 7,774,000	$ 10,100,000
Defined contribution pension plans	3,485,000	5,151,000	8,434,000	9,859,000
U. S. Plans
Defined benefit plans:
Service cost	471,000	391,000	943,000	783,000
Interest cost	3,203,000	3,381,000	6,411,000	6,770,000
Expected return on plan assets	(3,899,000)	(4,138,000)	(7,806,000)	(8,285,000)
Recognized prior service costs	47,000	62,000	95,000	124,000
Recognized losses	1,155,000	749,000	2,313,000	1,499,000
Amortization of transition liability	0	0	0	0
Settlement/curtailment loss (gain)	0	0	0	0
Defined benefit plans net periodic pension cost	977,000	445,000	1,956,000	891,000
Contributions by employer to defined benefit pension plan	2,049,000	559,000	2,638,000	1,007,000
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	3,500,000		3,500,000
International Plans
Defined benefit plans:
Service cost	862,000	1,144,000	1,926,000	2,239,000
Interest cost	11,062,000	12,320,000	22,441,000	24,303,000
Expected return on plan assets	(10,690,000)	(13,715,000)	(21,735,000)	(26,248,000)
Recognized prior service costs	96,000	110,000	194,000	213,000
Recognized losses	3,747,000	2,849,000	7,479,000	5,627,000
Amortization of transition liability	0	15,000	8,000	29,000
Settlement/curtailment loss (gain)	(366,000)	0	(2,061,000)	30,000
Defined benefit plans net periodic pension cost	4,711,000	2,723,000	8,252,000	6,193,000
Contributions by employer to defined benefit pension plan	3,559,000	4,063,000	22,171,000	20,917,000
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	$ 8,000,000		$ 8,000,000