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Debt Obligations, net (Unsecured Notes Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Jun. 10, 2014
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of Debt |  |  |  | $ 430,048 | $ 1,445,635 |
Loss on early extinguishment of debt, net |  | $ (67) | $ (186) | $ (279) | (24,953) |
4.00% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated Interest Rates |  | 4.00% |  | 4.00% |  | 4.00%
Debt instrument, face amount |  |  |  |  |  | $ 550,000
5.00% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated Interest Rates |  | 5.00% |  | 5.00% |  | 5.00%
Debt instrument, face amount |  |  |  |  |  | $ 770,000
February 2013 Secured Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of Debt | $ 1,320,000 |  |  |  |  |
Early Repayment | February 2013 Secured Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on early extinguishment of debt, net |  |  |  |  | $ 22,800 |

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