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Investments (Details 7) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
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Gross unrealized losses with number of securities [Line Items] |  |
Available-for-sale Securities, Gross Unrealized Losses | $ 133,558,000 | $ 292,486,000
Less Than 20 Percent [Member] |  |
Gross unrealized losses with number of securities [Line Items] |  |
Available-for-sale Securities, Gross Unrealized Losses | 54,951,000 | 131,155,000
Percentage Of Total Gross Unrealized Losses | 41.20% | 44.80%
More Than Or Equal To 20 Percent For Less Than Six Months [Member] |  |
Gross unrealized losses with number of securities [Line Items] |  |
Available-for-sale Securities, Gross Unrealized Losses | 734,000 | 51,503,000
Percentage Of Total Gross Unrealized Losses | 0.50% | 17.60%
More Than Or Equal To 20 Percent For Six Months Or Greater [Member] |  |
Gross unrealized losses with number of securities [Line Items] |  |
Available-for-sale Securities, Gross Unrealized Losses | $ 77,873,000 | $ 109,828,000
Percentage Of Total Gross Unrealized Losses | 58.30% | 37.60%

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