Employee Benefit Plans (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Defined benefit plans:
Multiemployer pension plans	$ 3,295,000	$ 3,819,000
Defined contribution pension plans	4,949,000	4,708,000
U. S. Plans
Defined benefit plans:
Service cost	472,000	392,000
Interest cost	3,209,000	3,389,000
Expected return on plan assets	(3,907,000)	(4,147,000)
Recognized prior service costs	47,000	62,000
Recognized losses	1,158,000	750,000
Defined benefit plans net periodic pension cost	979,000	446,000
Contributions by employer to defined benefit pension plan	589,000	448,000
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	8,700,000
International Plans
Defined benefit plans:
Service cost	1,064,000	1,094,000
Interest cost	11,378,000	11,983,000
Expected return on plan assets	(11,044,000)	(12,533,000)
Recognized prior service costs	99,000	104,000
Recognized losses	3,731,000	2,778,000
Amortization of transition liability	9,000	14,000
Settlement/curtailment loss (gain)	(1,696,000)	30,000
Defined benefit plans net periodic pension cost	3,541,000	3,470,000
Contributions by employer to defined benefit pension plan	18,612,000	16,854,000
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	$ 11,600,000