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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, 2017 | Jun. 16, 2017 | Dec. 31, 2016 | Jul. 17, 2013
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Notes and loan payable | $ 494,093 |  | $ 493,755 |
June 2027 Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | 500,000 | $ 500,000 | 0 |
Unamortized debt issue costs | (5,572) |  | 0 |
Unamortized debt issue costs | (335) | $ (300) | 0 |
July 2021 Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | 0 |  | 400,000 | $ 400,000
Unamortized debt issue costs | 0 |  | (5,733) |
Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | 0 |  | 100,000 |
Unamortized debt issue costs | $ 0 |  | $ (512) |

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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: 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 2: 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 + Details
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