Retirement Plans - Reconciliation of Level 3 Hedge Fund Asset Within Fair Value Hierarchy (Details 11) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Level 3 fund assets
Beginning Balance	$ 329,581
Ending Balance	290,795	$ 329,581
International hedge funds
Reconciliation of Level 3 fund assets
Beginning Balance	11,679
Ending Balance	25,191	11,679
Long/short equity-focused hedge funds
Reconciliation of Level 3 fund assets
Beginning Balance	5,367
Ending Balance	5,255	5,367
Significant Unobservable Inputs (Level 3)
Reconciliation of Level 3 fund assets
Beginning Balance	40,760
Ending Balance	43,806	40,760
Significant Unobservable Inputs (Level 3) \| International hedge funds
Reconciliation of Level 3 fund assets
Beginning Balance	11,679	10,958
Capital contributions	12,700	0
Realized and unrealized gain	812	721
Ending Balance	25,191	11,679
Significant Unobservable Inputs (Level 3) \| Long/short equity-focused hedge funds
Reconciliation of Level 3 fund assets
Beginning Balance	5,367	11,147
Capital contributions	0	0
Capital distributions	(180)	(6,178)
Realized and unrealized gain	68	398
Ending Balance	$ 5,255	$ 5,367

Defined Benefit Plan Distributions By Employer

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- Definition

Defined benefit plan realized and unrealized gain.

+ References

No definition available.

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- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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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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