Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Amortization of:
Contribution to pension plans			$ 7,900
Estimated total contributions			36,000
Pension Benefits [Member]
Amortization of:
Net periodic benefit cost (credit)	$ 10,296	$ 6,289	20,814	$ 14,423
Company Administered Plan [Member] | Pension Benefits [Member]
Components of net periodic benefit cost
Service cost	3,566	3,171	7,193	6,594
Interest cost	22,048	25,135	43,935	50,696
Expected return on plan assets	(25,021)	(29,284)	(49,921)	(58,002)
Amortization of:
Net actuarial loss (gain)	7,664	5,579	15,472	11,814
Prior service credit	(74)	(435)	(150)	(893)
Net periodic benefit cost (credit)	8,183	4,166	16,529	10,209
Company Administered Plan [Member] | Pension Benefits U.S. [Member]
Amortization of:
Net periodic benefit cost (credit)	8,599	4,499	17,491	10,786
Company Administered Plan [Member] | Pension Benefits Non-U.S. [Member]
Amortization of:
Net periodic benefit cost (credit)	(416)	(333)	(962)	(577)
Company Administered Plan [Member] | Postretirement Benefits [Member]
Components of net periodic benefit cost
Service cost	79	89	190	224
Interest cost	275	348	559	713
Amortization of:
Net actuarial loss (gain)	(278)	(234)	(474)	(363)
Prior service credit	(478)	(615)	(956)	(1,230)
Net periodic benefit cost (credit)	(402)	(412)	(681)	(656)
Company Administered Plan [Member] | Postretirement Benefits U.S [Member]
Amortization of:
Net periodic benefit cost (credit)	(531)	(524)	(946)	(921)
Company Administered Plan [Member] | Postretirement Benefits Non-U.S [Member]
Amortization of:
Net periodic benefit cost (credit)	129	112	265	265
Union Administered Plan [Member] | Pension Benefits [Member]
Amortization of:
Net periodic benefit cost (credit)	$ 2,113	$ 2,123	$ 4,285	$ 4,214