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Indebtedness (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments [Table Text Block] |
Outstanding Debt |  |  |  |  |  |  |  |  |  | 2017 |  | Carry Value
($ in thousands) |  | Issuance Date |  | Maturity Date |  | Interest Rate |  | Original Amount |  | Debt Discount and Unamortized Issuance Costs |  | December 31, 2017 |  | December 31, 2016
Description |  |  |  |  |  |  |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |  |
(1) FHLBI |  | 12/16/2016 |  | 12/16/2026 |  | 3.03 | % |  | $ | 60,000 |  |  | — |  |  | 60,000 |  |  | 60,000 |
(2) FHLBNY |  | 8/15/2016 |  | 8/16/2021 |  | 1.56 | % |  | 25,000 |  |  | — |  |  | 25,000 |  |  | 25,000 |
(2) FHLBNY |  | 7/21/2016 |  | 7/21/2021 |  | 1.61 | % |  | 25,000 |  |  | — |  |  | 25,000 |  |  | 25,000 |
(3) Senior Notes |  | 2/8/2013 |  | 2/9/2043 |  | 5.875 | % |  | 185,000 |  |  | (4,570 | ) |  | 180,430 |  |  | 180,068 |
(4) Senior Notes |  | 11/3/2005 |  | 11/1/2035 |  | 6.70 | % |  | 100,000 |  |  | (989 | ) |  | 99,011 |  |  | 98,952 |
(5) Senior Notes |  | 11/16/2004 |  | 11/15/2034 |  | 7.25 | % |  | 50,000 |  |  | (325 | ) |  | 49,675 |  |  | 49,647 |
Total long-term debt |  |  |  |  |  |  |  |  | $ | 445,000 |  |  | (5,884 | ) |  | 439,116 |  |  | 438,667 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: 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=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 + Details
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