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Long-Term Debt - Narrative (Details) (USD $) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Broker Repurchase Agreements | Nov. 30, 2012 Broker Repurchase Agreements
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] |  |  |  |
2014 |  |  | 4,900,000 |
2015 |  |  | 5,000,000 |
2016 |  |  | 5,100,000 |
2017 |  |  | 4,800,000 |
Prepayment penalty | (19,766,000) | (24,601,000) | 19,766,000 |
Long-term debt with contractual maturity longer than five years | 176,745,000 | 152,171,000 |  |
Long term debt, callable by the issuer in 2013 | $ 150,000,000 |  |  |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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