Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Defined benefit plans:
Decrease in Net Periodic Pension Cost Due to Change in Method	$ 2,000		$ 5,000
Multiemployer pension plans	494	$ 570	1,520	$ 1,876
Defined contribution pension plans	2,291	2,619	7,593	8,884
U. S. Plans
Defined benefit plans:
Service cost	945	722	2,837	2,167
Interest cost	2,545	3,089	7,635	9,268
Expected return on plan assets	(3,601)	(4,203)	(10,803)	(12,609)
Recognized prior service costs	16	20	47	60
Recognized loss	1,373	1,230	4,117	3,689
Settlement/curtailment losses	223	0	223	0
Defined benefit plans net periodic pension cost	1,501	858	4,056	2,575
Defined benefit pension plan	471	567	1,411	1,841
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year			500
International Plans
Defined benefit plans:
Service cost	405	428	1,214	1,320
Interest cost	6,542	9,146	20,649	27,475
Expected return on plan assets	(10,475)	(12,630)	(33,157)	(37,914)
Recognized prior service costs	44	47	133	144
Recognized loss	2,923	4,244	9,283	12,700
Settlement/curtailment losses	0	0	0	0
Defined benefit plans net periodic pension cost	(561)	1,235	(1,878)	3,725
Defined benefit pension plan	$ 3,170	$ 3,935	16,222	$ 24,166
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year			$ 3,400