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Retirement Plans (Weighted-Average Expense Assumptions) (Details)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Retirement Income Plan [Member]
Discount rate	5.55%	5.93%
Expected return on plan assets	8.00%	8.00%
Rate of compensation increase	4.00%	4.00%
Retirement Life Plan [Member]
Discount rate	5.55%	5.93%
Expected return on plan assets	0.00%	0.00%
Rate of compensation increase	0.00%	0.00%

X

- Definition

The interest rate used to adjust for the time value of money.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph j

+ Details

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Namespace Prefix:	us-gaap
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph j

+ Details

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Namespace Prefix:	us-gaap
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Period Type:	duration

X

- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph j

+ Details

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Namespace Prefix:	us-gaap
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