Investments (Details Textual) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Investments (Textual) [Abstract]
Sale of debt securities, realized gains	$ 0	$ 5,000	$ 3,000	$ 27,000
Sale of debt securities, realized losses	0	10,000	0	22,000
Recognized unrealized gains in accumulated other comprehensive income	41,000		41,000		16,000
Recognized unrealized losses in accumulated other comprehensive income	0		0		5,000
Other-than-temporary impairments before taxes		0	11,000	0
Auction rate instruments recovery period, minimum, months			12 months
Auction Rate Municipal Securities [Member]
Investments (Textual) [Abstract]
Auction rate securities, par value	$ 1,100,000		$ 1,100,000		$ 1,100,000
Maturity dates for auction rate securities range, low			2030
Maturity dates for auction rate securities range, high			2036

Auction market preferred securities stock series recovery period.

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- Definition

Available for sale securities debt maturities year maximum.

+ References

No definition available.

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Available for sale securities debt maturities year minimum.

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- Definition

Recognized unrealized gains in accumulated other comprehensive income.

+ References

No definition available.

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- Definition

Recognized unrealized losses in accumulated other comprehensive income.

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No definition available.

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- Definition

Amount of par or stated value of auction preferred securities.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

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-Name Statement of Financial Accounting Standard (FAS)

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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15D

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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