Employee Benefit Plans (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Defined benefit plans:
Multiemployer pension plans	$ 966,000	$ 5,699,000	$ 1,667,000	$ 8,515,000
Defined contribution pension plans	2,930,000	4,070,000	6,999,000	8,821,000
U. S. Plans
Defined benefit plans:
Service cost	558,000	642,000	1,116,000	1,283,000
Interest cost	3,217,000	2,944,000	6,434,000	5,884,000
Expected return on plan assets	(4,196,000)	(3,913,000)	(8,392,000)	(7,822,000)
Recognized prior service costs	22,000	35,000	44,000	72,000
Recognized loss	838,000	1,264,000	1,676,000	2,526,000
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	0	0	0	0
Defined benefit plans net periodic pension cost	439,000	972,000	878,000	1,943,000
Defined benefit pension plan	582,000	565,000	1,148,000	1,048,000
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year			9,000,000
International Plans
Defined benefit plans:
Service cost	411,000	900,000	818,000	1,808,000
Interest cost	11,012,000	10,762,000	21,924,000	21,545,000
Expected return on plan assets	(12,708,000)	(11,800,000)	(25,296,000)	(23,619,000)
Recognized prior service costs	47,000	94,000	93,000	184,000
Recognized loss	3,583,000	4,149,000	7,136,000	8,300,000
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	56,000	(289,000)	56,000	(289,000)
Defined benefit plans net periodic pension cost	2,401,000	3,816,000	4,731,000	7,929,000
Defined benefit pension plan	4,316,000	3,320,000	21,737,000	20,956,000
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year			$ 10,000,000