Employee Benefit Plans (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Defined benefit plans:
Multiemployer pension plans	$ 565,000	$ 701,000
Defined contribution pension plans	3,806,000	4,069,000
U. S. Plans
Defined benefit plans:
Service cost	722,000	558,000
Interest cost	3,089,000	3,217,000
Expected return on plan assets	(4,203,000)	(4,196,000)
Recognized prior service costs	20,000	22,000
Recognized loss	1,230,000	838,000
Recognized loss	858,000	439,000
Defined benefit pension plans:	682,000	566,000
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year			1,800,000
International Plans
Defined benefit plans:
Service cost	438,000	407,000
Interest cost	9,189,000	10,912,000
Expected return on plan assets	(12,674,000)	(12,588,000)
Recognized prior service costs	49,000	46,000
Recognized loss	4,235,000	3,553,000
Recognized loss	1,237,000	2,330,000
Defined benefit pension plans:	16,066,000	17,421,000
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year			$ 13,800,000