Employee Benefit Plans (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Defined benefit plans:
Multiemployer pension plans	$ 2,816,000	$ 3,295,000
Defined contribution pension plans	4,828,000	4,949,000
U. S. Plans
Defined benefit plans:
Service cost	641,000	472,000
Interest cost	2,941,000	3,209,000
Expected return on plan assets	(3,909,000)	(3,907,000)
Recognized prior service costs	35,000	47,000
Recognized losses	1,263,000	1,158,000
Amortization of transition liability	0	0
Settlement/curtailment gain	0	0
Defined benefit plans net periodic pension cost	971,000	979,000
Defined benefit pension plan	483,000	589,000
International Plans
Defined benefit plans:
Service cost	909,000	1,064,000
Interest cost	10,781,000	11,378,000
Expected return on plan assets	(11,819,000)	(11,044,000)
Recognized prior service costs	92,000	99,000
Recognized losses	4,150,000	3,731,000
Amortization of transition liability	0	9,000
Settlement/curtailment gain	0	(1,696,000)
Defined benefit plans net periodic pension cost	4,113,000	3,541,000
Defined benefit pension plan	17,559,000	18,612,000
U. S. Plans
Defined benefit plans:
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	2,300,000
International Plans
Defined benefit plans:
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	$ 13,200,000