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Long-Term Debt - Narrative (Details) (USD $) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Broker Repurchase Agreements | Nov. 30, 2012 Broker Repurchase Agreements | Dec. 31, 2011 Vision Bank
Debt Instrument [Line Items] |  |  |  |  |
Debt repurchased during period |  |  |  | $ 300,000,000 |
Debt repurchased during period, rate |  |  |  | 1.75% |
Total prepayment penalty |  |  | 25,000,000 |  |
Effective interest rate percentage |  |  | 3.40% |  |
Prepayment Penalty, Future Amortization Expense [Abstract] |  |  |  |  |
2013 |  |  | 4,800,000 |  |
2014 |  |  | 4,900,000 |  |
2015 |  |  | 5,000,000 |  |
2016 |  |  | 5,100,000 |  |
2017 |  |  | 4,800,000 |  |
Prepayment penalty | 24,601,000 | 0 | 24,601,000 |  |
Capital lease obligation pertaining to acquisition of Vision |  |  |  |  | 1,400,000
Long-term debt with contractual maturity longer than five years | 252,259,000 | 253,175,000 |  |  |
Long term debt, callable by the issuer in 2013 | $ 250,000,000 |  |  |  |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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