Retirement Arrangement (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of benefit obligation:
Obligation at January 1	$ 6,453,000	$ 6,665,000
Obligation at December 31	6,882,000	6,453,000	6,665,000
CEO Transition Cost	19,688,000us-gaap_OtherRestructuringCosts
Restricted Stock, Deferred	9,223,000us-gaap_RestrictedStockExpense
Consulting, retirement payments and other costs	10,465,000
Retirement Arrangements (Textuals) [Abstract]
Defined Contribution Plan Contributions By Employer	2,701,000	2,562,000	2,140,000
Expected benefit payments under SERP for next five fiscal years	7,128,000	3,069,000
Expected Benefit Payments Under SERP Thereafter		4,604,000
Accrued liability for SERP	$ 6,882,000	$ 6,453,000	$ 6,665,000

Defined Benefit Plan Expected Future Benefit Payments In Next Five Year.

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- Definition

Defined Contribution Plan Contributions By Employer.

+ References

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- Definition

Expected benefit payments under SERP thereafter.

+ References

No definition available.

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- Definition

Amount of asset retirement obligations (ARO) costs incurred (whether capitalized or charged to expense) during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)(1)

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

+ 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 (a)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Projected Benefit Obligation

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Postretirement Benefit Obligation

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- Definition

Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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-Topic 420

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-Section 50

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-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

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-Subparagraph (SAB TOPIC 5.P.4(b))

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

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The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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