Financial Instruments And Investments (Unrecognized Gross Unrealized Gains And The Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financial Instruments and Investments [Line Items]
Fair Value	$ 158,634	$ 139,509
Unrealized Gains	29,039	20,124
Collateralized Mortgage Backed Securities
Financial Instruments and Investments [Line Items]
Fair Value	17,289	25,077
Unrealized Gains	1,036	1,220
U.S. Government Bonds
Financial Instruments and Investments [Line Items]
Fair Value	13,295	10,263
Unrealized Gains	678	972
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Securities	24,385
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value	3,174
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	7,287
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	8,605
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	5,319
Municipal Bonds
Financial Instruments and Investments [Line Items]
Fair Value	22,797	30,310
Unrealized Gains	1,531	1,792
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Securities	33,863
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value	2,326
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	12,223
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	14,483
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	4,831
Corporate Debt Securities
Financial Instruments and Investments [Line Items]
Fair Value	12,378	7,641
Unrealized Gains	1,134	459
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Securities	12,830
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value	432
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	4,653
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	3,991
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	3,754
Debt Securities
Financial Instruments and Investments [Line Items]
Fair Value	65,759	73,291
Unrealized Gains	4,379	4,443
Equity Securities
Financial Instruments and Investments [Line Items]
Fair Value	73,210	62,479
Unrealized Gains	22,839	15,681
Mutual Funds - Equity
Financial Instruments and Investments [Line Items]
Fair Value	15,194	0
Unrealized Gains	1,821	0
Cash and Cash Equivalents
Financial Instruments and Investments [Line Items]
Fair Value	4,471	3,739
Unrealized Gains	$ 0	$ 0

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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

-Publisher FASB

-Name Accounting Standards Codification

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-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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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Number 115

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

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Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

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-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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-URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558

+ Details

- Definition

This item represents the fair value of debt securities which are expected to mature after five years and through ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details

- Definition

This item represents the fair value of debt securities which are expected to mature after one year and through five years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details

- Definition

This item represents the fair value of debt securities which are expected to mature within one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details

- Definition

For an unclassified balance sheet, total of debt securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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

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-Number 115

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-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.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

-Number 133

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-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.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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-Number 115

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-Publisher FASB

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section 25

-Paragraph 1

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-URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558

+ Details

- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details