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Notes Payable (Details) (USD $) |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  | 0 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 Notes Payable under Revolving Credit Agreement 2016 Credit Agreement [Member] | Dec. 31, 2013 Notes Payable under Revolving Credit Agreement 2016 Credit Agreement [Member] | Mar. 07, 2012 Notes Payable under Revolving Credit Agreement 2016 Credit Agreement [Member] | Dec. 31, 2011 Notes Payable under Revolving Credit Agreement Former Credit Agreement [Member] | Dec. 31, 2013 Notes Payable under Revolving Credit Agreement Former Credit Agreement [Member] | Mar. 07, 2012 Notes Payable under Revolving Credit Agreement Former Credit Agreement [Member] | Dec. 31, 2007 Senior Notes [Member] Senior Notes, 6% Due May 15, 2017 [Member] | Dec. 31, 2013 Senior Notes [Member] Senior Notes, 6% Due May 15, 2017 [Member] | Nov. 24, 2010 Senior Notes [Member] Senior Notes, 6% Due November 30, 2015 [Member] | Dec. 31, 2013 Senior Notes [Member] Senior Notes, 6% Due November 30, 2015 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Length of Agreement |  | 4 years |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 225,000,000 | $ 325,000,000 |  | $ 245,000,000.0 |  |  |  |  |
Increase in Maximum Indebtedness Related to Advances from FHLB and Issuance of Surplus Notes | 150,000,000 |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available | 250,000,000 |  |  |  |  |  |  |  |  |  |
Maximum Indebtedness, Issuance of Surplus Notes | 100,000,000 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Reduction of Borrowing Capacity |  |  | 100,000,000 |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding |  |  | 0 |  | 0 |  | 0 |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | 225,000,000 |  |  |  |  |  |  |  |
Revolving Credit Agreement |  |  |  |  | 95,000,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  | 6.00% |  | 6.00%
Debt Instrument, Face Amount |  |  |  |  |  |  |  | 360,000,000 |  | 250,000,000 |
Proceeds from Debt, Net of Issuance Costs |  |  |  |  |  |  |  | $ 354,800,000 |  | $ 247,800,000 |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  | 6.19% |  | 6.21% |

X
- Definition An increase to the amount of indebtedness that may be incurred and outstanding in connection with borrowings from the FHLB or issuances of surplus notes. + References No definition available. + Details
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- Definition Line of Credit Facility, Length of Agreement + References No definition available. + Details
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- Definition A reduction to the line of credit facility borrowing capacity due to an amendment to the credit agreement. + References No definition available. + Details
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- Definition The maximum aggregate indebtedness in connection with advances from the FHLB and issuance of surplus notes. + References No definition available. + Details
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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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