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Notes and Loan Payable and Amounts Due Under Repurchase Agreements Notes and Loan Payable and Amounts Due Under Repurchase Agreements (2027 Notes Narrative) (Details) (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 17, 2017 | Jun. 16, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 0 | $ 18,389 | $ 428 | $ 0 | $ 18,817 | $ 0 | $ 0
June 2027 Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 500,000 | 500,000 |  |  |  | 500,000 | 0 |
Interest rate |  | 5.00% |  |  |  |  |  |  |
Unamortized debt issue costs |  | $ (300) | $ (335) |  |  |  | $ (335) | $ 0 |
Deferred financing costs |  | 5,800 |  |  |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  | $ 100,000 |  |  |  |  |  |  |
July 2021 Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount | $ 400,000 |  |  |  |  |  |  |  |
Extinguishment of debt, cash paid | $ 413,300 |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage | 3.313% |  |  |  |  |  |  |  |
Loss on extinguishment of debt | $ 18,400 |  |  |  |  |  |  |  |

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