Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Amortization of:
Contribution to pension plans			$ 29,900
Estimated total contributions			35,000
Pension Benefits [Member]
Amortization of:
Net periodic benefit cost (credit)	$ 10,049	$ 8,607	30,863	$ 23,084
Company Administered Plan [Member] | Pension Benefits [Member]
Components of net periodic benefit cost
Service cost	3,612	3,297	10,805	9,892
Interest cost	21,777	25,280	65,712	75,990
Expected return on plan assets	(24,697)	(28,900)	(74,618)	(86,916)
Amortization of:
Net actuarial loss (gain)	7,665	5,900	23,137	17,714
Prior service credit	(80)	(445)	(230)	(1,340)
Net periodic benefit cost (credit)	8,277	5,132	24,806	15,340
Company Administered Plan [Member] | Pension Benefits U.S. [Member]
Amortization of:
Net periodic benefit cost (credit)	8,746	5,389	26,237	16,190
Company Administered Plan [Member] | Pension Benefits Non-U.S. [Member]
Amortization of:
Net periodic benefit cost (credit)	(469)	(257)	(1,431)	(850)
Company Administered Plan [Member] | Postretirement Benefits [Member]
Components of net periodic benefit cost
Service cost	88	112	278	336
Interest cost	270	356	829	1,069
Amortization of:
Net actuarial loss (gain)	(235)	(181)	(709)	(544)
Prior service credit	(477)	(616)	(1,433)	(1,844)
Net periodic benefit cost (credit)	(354)	(329)	(1,035)	(983)
Company Administered Plan [Member] | Postretirement Benefits U.S [Member]
Amortization of:
Net periodic benefit cost (credit)	(469)	(460)	(1,415)	(1,379)
Company Administered Plan [Member] | Postretirement Benefits Non-U.S [Member]
Amortization of:
Net periodic benefit cost (credit)	115	131	380	396
Union Administered Plan [Member] | Pension Benefits [Member]
Amortization of:
Net periodic benefit cost (credit)	$ 1,772	$ 3,475	$ 6,057	$ 7,744