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Debt Obligations, net (Unsecured Notes Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 10, 2014
Debt Instrument [Line Items] |  |  |  |
Repayments of Debt |  | $ 247,055 | $ 1,408,935 |
4.00% senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated Interest Rates |  | 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%
Debt instrument, face amount |  |  |  | $ 770,000
February 2013 Secured Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of Debt | $ 1,320,000 |  |  |
Early Repayment [Member] | February 2013 Secured Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Lender Fees, Amount Recorded as a Loss on Early Extinguishment of Debt | $ 22,800 |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: 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=34725769&loc=d3e28878-108400 Reference 2: 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=6451184&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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