Employee Benefit Plans (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Defined benefit plans:
Multiemployer pension plans	$ 3,527,000	$ 3,127,000	$ 12,042,000	$ 10,901,000
Defined contribution pension plans	3,471,000	5,971,000	12,292,000	14,405,000
U. S. Plans
Defined benefit plans:
Service cost	641,000	472,000	1,924,000	1,415,000
Interest cost	2,942,000	3,209,000	8,825,000	9,620,000
Expected return on plan assets	(3,911,000)	(3,907,000)	(11,732,000)	(11,713,000)
Recognized prior service costs	36,000	47,000	108,000	142,000
Recognized loss	1,263,000	1,158,000	3,789,000	3,471,000
Amortization of transition liability			0	0
Settlement/curtailment (gains) losses	0	1,112,000	0	1,112,000
Defined benefit plans net periodic pension cost	971,000	2,091,000	2,914,000	4,047,000
Defined benefit pension plan	919,000	3,024,000	1,967,000	5,662,000
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year			800,000
International Plans
Defined benefit plans:
Service cost	822,000	855,000	2,630,000	2,781,000
Interest cost	10,512,000	10,996,000	32,058,000	33,437,000
Expected return on plan assets	(11,540,000)	(10,638,000)	(35,159,000)	(32,373,000)
Recognized prior service costs	87,000	95,000	271,000	289,000
Recognized loss	4,065,000	3,730,000	12,364,000	11,209,000
Amortization of transition liability			0	8,000
Settlement/curtailment (gains) losses	0	6,000	(289,000)	(2,055,000)
Defined benefit plans net periodic pension cost	3,946,000	5,044,000	11,875,000	13,296,000
Defined benefit pension plan	4,484,000	4,127,000	25,440,000	26,298,000
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year			$ 5,700,000