Employee Benefits Plans (Details 2) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Change in benefit obligations:
Pension annuity settlement	$ (5,454)	$ (7,650)	$ 509
Change in plan assets:
Funded percent	84.00%	80.00%
Pension Plans
Change in benefit obligations:
Benefit obligations at January 1	$ 2,228,762	$ 2,091,844
Interest cost	86,431	94,476
Actuarial loss	100,905	189,523
Pension annuity settlement	(66,423)	0
Benefits paid	(104,054)	(96,723)
Foreign currency exchange rate changes	40,936	(63,335)
Benefit obligations at December 31	2,298,902	2,228,762	2,091,844
Change in plan assets:
Fair value of plan assets at January 1	1,787,075	1,647,286
Actual return on plan assets	244,916	176,066
Employer contribution	41,219	127,991
Benefits paid	(104,054)	(96,723)
Foreign currency exchange rate changes	43,473	(67,545)
Fair value of plan assets at December 31	1,941,330	1,787,075	1,647,286
Funded status	(357,572)	(441,687)
Company Administered Plan [Member]
Change in benefit obligations:
Service cost	12,345	12,977	13,820
Interest cost	$ 86,431	$ 94,476	$ 88,013

Multiemployer Plans, One Time Charge For Pension Settlement, Pre-Tax, Expense (Benefit)

No definition available.

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- Definition

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

+ References

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- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

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- Definition

Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 60
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

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-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

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- Definition

Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan.

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- Definition

Percentage of plan assets to benefit obligation of defined benefit plan.

+ References

No definition available.

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- Definition

Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

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- Definition

Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan.

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- Definition

Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

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