Employee Benefit Plans (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Defined benefit plans:
Multiemployer pension plans	$ 667,000	$ 3,527,000	$ 2,334,000	$ 12,042,000
Defined contribution pension plans	3,322,000	3,471,000	10,321,000	12,292,000
U. S. Plans
Defined benefit plans:
Service cost	558,000	641,000	1,675,000	1,924,000
Interest cost	3,217,000	2,942,000	9,651,000	8,825,000
Expected return on plan assets	(4,196,000)	(3,911,000)	(12,590,000)	(11,732,000)
Recognized prior service costs	22,000	36,000	68,000	108,000
Recognized loss	838,000	1,263,000	2,514,000	3,789,000
Amortization of transition liability			0	0
Settlement/curtailment gains			0	0
Defined benefit plans net periodic pension cost	439,000	971,000	1,318,000	2,914,000
Defined benefit pension plan	5,909,000	919,000	7,057,000	1,967,000
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year			500,000
International Plans
Defined benefit plans:
Service cost	394,000	822,000	1,213,000	2,630,000
Interest cost	11,024,000	10,512,000	32,948,000	32,058,000
Expected return on plan assets	(12,743,000)	(11,540,000)	(38,039,000)	(35,159,000)
Recognized prior service costs	46,000	87,000	138,000	271,000
Recognized loss	3,596,000	4,065,000	10,732,000	12,364,000
Amortization of transition liability			56,000	0
Settlement/curtailment gains			0	(289,000)
Defined benefit plans net periodic pension cost	2,317,000	3,946,000	7,048,000	11,875,000
Defined benefit pension plan	4,226,000	4,484,000	25,963,000	25,440,000
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year			$ 4,000,000