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Fair Value Measurements (Reconciliation Of Amortized Cost of Fair Value of Investments) (Details) (USD $) | 3 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2011 | Dec. 31, 2010
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |  |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis | $ 3,414,960,000 |  | $ 3,119,510,000 |
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] |  |  |  |
Available-for-sale Securities, Gross Unrealized Gains | 134,441,000 |  | 135,959,000 |
Available-for-sale Securities, Gross Unrealized Losses | (1,325,000) |  | (325,000) |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 3,548,076,000 |  | 3,255,144,000 |
Investment Yield [Abstract] |  |  |  |
Available-for-sale Securities, Yield | 4.54% |  | 4.62% |
Held-to-maturity Securities, Yield | 5.32% |  | 5.33% |
Yield | 4.55% |  | 4.63% |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |  |  |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount | 42,226,000 |  | 47,036,000 |
Held to Maturity Securities, Gross Unrecognized Gains (Losses) [Abstract] |  |  |  |
Held-to-maturity Securities, Unrecognized Holding Gain | 3,259,000 |  | 3,580,000 |
Held to Maturity, Gross Unrecognized Losses [Abstract] |  |  |  |
Held-to-maturity Securities, Unrecognized Holding Loss | 0 |  | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |  |  |
Held-to-maturity Securities, Debt Maturities, Fair Value | 45,485,000 |  | 50,616,000 |
Investments | 3,457,186,000 |  | 3,166,546,000 |
Gross Unrealized Gains on Investments | 137,700,000 |  | 139,539,000 |
Gross Unrealized Losses on Investments | (1,325,000) |  | (325,000) |
Investments, Fair Value Disclosure | 3,593,561,000 |  | 3,305,760,000 |
Available-for-sale securities sold | 3,500,000 | 0 |  |
Gain on sale of investments | 0 |  |  | 0
US Treasury and Government [Member] |  |  |  |
Investment Yield [Abstract] |  |  |  |
Yield, After One Through Five Years | 0.00% |  | 0.00% |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |  |  |
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount | 0 |  | 0 |
Held to Maturity Securities, Gross Unrecognized Gains (Losses) [Abstract] |  |  |  |
Unrecognized Gains, After One Through Five Years | 0 |  | 0 |
Held to Maturity, Gross Unrecognized Losses [Abstract] |  |  |  |
Unrecognized Holding Losses, After One Year Through Five Years | 0 |  | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |  |  |
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value | 0 |  | 0 |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |  |
Investment Yield [Abstract] |  |  |  |
Yield, Without Single Maturity | 5.31% |  | 5.31% |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |  |  |
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount | 41,431,000 |  | 45,086,000 |
Held to Maturity Securities, Gross Unrecognized Gains (Losses) [Abstract] |  |  |  |
Gross Unrecognized Gains Without Single Maturity | 3,220,000 |  | 3,507,000 |
Held to Maturity, Gross Unrecognized Losses [Abstract] |  |  |  |
Gross Unrecognized Losses Without Single Maturity | 0 |  | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |  |  |
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value | 44,651,000 |  | 48,593,000 |
Municipal Bonds [Member] |  |  |  |
Investment Yield [Abstract] |  |  |  |
Yield, After One Through Five Years | 0.00% |  | 6.52% |
Yield, After Five Through Ten Years | 5.58% |  | 5.60% |
Yield, After Ten Years | 0.00% |  | 0.00% |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |  |  |
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount | 0 |  | 405,000 |
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount | 795,000 |  | 1,545,000 |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount | 0 |  | 0 |
Held to Maturity Securities, Gross Unrecognized Gains (Losses) [Abstract] |  |  |  |
Unrecognized Gains, After One Through Five Years | 0 |  | 5,000 |
Unrecognized Holding Gains, After Five Years Through Ten Years | 39,000 |  | 68,000 |
Gross Unrecognized Gains, After Ten Years | 0 |  | 0 |
Held to Maturity, Gross Unrecognized Losses [Abstract] |  |  |  |
Unrecognized Holding Losses, After One Year Through Five Years | 0 |  | 0 |
Unrecognized Holding Losses, After Five Through Ten Years | 0 |  | 0 |
Gross Unrecognized Losses, After Ten Years | 0 |  | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |  |  |
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value | 0 |  | 410,000 |
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 834,000 |  | 1,613,000 |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value | 0 |  | 0 |
Municipal Bonds [Member] |  |  |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |  |  |
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis | 20,456,000 |  | 20,461,000 |
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] |  |  |  |
Gross Unrealized Gains, After Ten Years | 3,254,000 |  | 3,107,000 |
Gross Unrealized Losses, Over Ten Years | 0 |  | 0 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |  |
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 23,710,000 |  | 23,568,000 |
Investment Yield [Abstract] |  |  |  |
Yield, After Ten Years | 6.45% |  | 6.45% |
US Treasury and Government [Member] |  |  |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |  |  |
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis | 500,000 |  | 500,000 |
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis | 0 |  | 0 |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis | 9,300,000 |  | 9,300,000 |
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis | 136,460,000 |  | 175,515,000 |
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] |  |  |  |
Gross Unrealized Gains, Within One Year | 30,000 |  | 34,000 |
Gross Unrealized Gains After One Through Five Years | 0 |  | 0 |
Gross Unrealized Gains, Five Through Ten Years | 4,324,000 |  | 4,547,000 |
Gross Unrealized Gains, After Ten Years | 611,000 |  | 631,000 |
Gross Unrealized Losses, Within One Year | 0 |  | 0 |
Gross Unrealized Losses, AFter One Through Five Years | 0 |  | 0 |
Gross Unrealized Losses, After Five Years Through Ten Years | 0 |  | 0 |
Gross Unrealized Losses, Over Ten Years | 0 |  | 0 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |  |
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value | 530,000 |  | 534,000 |
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 0 |  | 0 |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 13,624,000 |  | 13,847,000 |
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 137,071,000 |  | 176,146,000 |
Investment Yield [Abstract] |  |  |  |
Yield, Within One Year | 4.00% |  | 4.00% |
Yield, After One Through Five Years | 0.00% |  | 0.00% |
Yield, After Five Through Ten Years | 10.38% |  | 10.38% |
Yield, After Ten Years | 2.16% |  | 2.57% |
Corporate Debt Securities [Member] |  |  |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |  |  |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis | 30,000,000 |  | 30,000,000 |
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] |  |  |  |
Gross Unrealized Gains, Five Through Ten Years | 308,000 |  | 284,000 |
Gross Unrealized Losses, After Five Years Through Ten Years | (937,000) |  | (325,000) |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |  |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 29,371,000 |  | 29,959,000 |
Investment Yield [Abstract] |  |  |  |
Yield, After Five Through Ten Years | 4.00% |  | 4.00% |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | 3,218,244,000 |  | 2,883,734,000 |
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] |  |  |  |
Gross Unrealized Gains Without Single Maturity | 125,914,000 |  | 127,356,000 |
Gross Unrealized Losses Without Single Maturity | (388,000) |  | 0 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | $ 3,343,770,000 |  | $ 3,011,090,000 |
Investment Yield [Abstract] |  |  |  |
Yield, Without Single Maturity | 4.62% |  | 4.72% |

X
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- Definition This item represents debt securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature after ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph d -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents the total of all debt securities grouped by maturity dates, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are classified neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents debt securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph a -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents debt securities, categorized neither as held-to-maturity nor trading securities, which do not have a single maturity date and which the Company has decided to disclose separately rather than allocating such cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, over several maturity groupings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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