Employee Benefit Plans (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Defined benefit plans:
Multiemployer pension plans	$ 3,127,000	$ 3,739,000	$ 10,901,000	$ 13,839,000
Defined contribution pension plans	5,971,000	5,791,000	14,405,000	15,650,000
U. S. Plans
Defined benefit plans:
Service cost	472,000	391,000	1,415,000	1,174,000
Interest cost	3,209,000	3,381,000	9,620,000	10,151,000
Expected return on plan assets	(3,907,000)	(4,138,000)	(11,713,000)	(12,423,000)
Recognized prior service costs	47,000	62,000	142,000	186,000
Recognized losses	1,158,000	749,000	3,471,000	2,248,000
Amortization of transition liability	0	0	0	0
Settlement/curtailment loss (gain)	1,112,000	0	1,112,000	0
Defined benefit plans net periodic pension cost	2,091,000	445,000	4,047,000	1,336,000
Defined benefit pension plan	3,024,000	1,459,000	5,662,000	2,466,000
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	855,000	1,120,000	2,781,000	3,359,000
Interest cost	10,996,000	12,166,000	33,437,000	36,469,000
Expected return on plan assets	(10,638,000)	(13,138,000)	(32,373,000)	(39,386,000)
Recognized prior service costs	95,000	107,000	289,000	320,000
Recognized losses	3,730,000	2,817,000	11,209,000	8,443,000
Amortization of transition liability	0	14,000	8,000	43,000
Settlement/curtailment loss (gain)	6,000	0	(2,055,000)	30,000
Defined benefit plans net periodic pension cost	5,044,000	3,086,000	13,296,000	9,278,000
Defined benefit pension plan	4,127,000	6,279,000	26,298,000	27,196,000
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	$ 3,900,000		$ 3,900,000