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Notes and Loan Payable and Amounts Due Under Repurchase Agreements (Schedule of Notes and Loan Payable) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Jul. 17, 2013
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Notes and loan payable | $ 493,755 |  | $ 393,227 |
July 2021 Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | 400,000 |  | 400,000 | $ 400,000
Unamortized debt issue costs | (5,733) |  | (6,773) |
Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | 100,000 | $ 100,000 | 0 |
Unamortized debt issue costs | $ (512) |  | $ 0 |

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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