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Debt Obligations, net (Details 4) (USD $) | 3 Months Ended | 9 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  | 3 Months Ended | 9 Months Ended |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended |  | 1 Months Ended | 9 Months Ended |  |  |  |  | 1 Months Ended |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  | 3 Months Ended |  | 9 Months Ended |
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 February 2013 Secured Credit Facility | Jun. 30, 2013 February 2013 Secured Credit Facility | Sep. 30, 2013 February 2013 Secured Credit Facility | Feb. 11, 2013 February 2013 Secured Credit Facility | Oct. 15, 2012 February 2013 Secured Credit Facility | Mar. 31, 2013 October 2012 Secured Credit Facility | Sep. 30, 2013 October 2012 Secured Credit Facility | Feb. 11, 2013 October 2012 Secured Credit Facility | Oct. 15, 2012 October 2012 Secured Credit Facility | Mar. 31, 2012 2012 Secured Credit Facilities tranches | Mar. 31, 2012 Secured 2012 Tranche A-1 Facility Due 2016 | Sep. 30, 2013 Secured 2012 Tranche A-1 Facility Due 2016 | Sep. 30, 2013 Secured 2012 Tranche A-1 Facility Due 2016 | Mar. 31, 2012 Secured 2012 Tranche A-2 Facility Due 2017 | Sep. 30, 2013 Secured 2012 Tranche A-2 Facility Due 2017 | Sep. 30, 2013 Secured 2012 Tranche A-2 Facility Due 2017 | Mar. 31, 2012 Unsecured Notes LIBOR plus 0.50% senior convertible notes | Sep. 30, 2013 Unsecured Notes LIBOR plus 0.50% senior convertible notes | Mar. 31, 2012 Unsecured Line of credit due June 2012 | Sep. 30, 2013 Unsecured Notes 5.50% senior notes | Sep. 30, 2013 Secured 2011 Tranche A-2 Facility Due 2014 | Sep. 30, 2013 Unsecured Notes 3.875% senior notes | May 31, 2013 Unsecured Notes 3.875% senior notes | Sep. 30, 2013 Unsecured Notes 4.875% senior notes | May 31, 2013 Unsecured Notes 4.875% senior notes | May 31, 2013 Unsecured Notes 8.625% senior notes | Sep. 30, 2013 Unsecured Notes 8.625% senior notes | May 31, 2013 Unsecured Notes 5.95% senior notes | Sep. 30, 2013 Unsecured Notes 5.95% senior notes | Sep. 30, 2013 Unsecured Notes 5.95% senior notes | Sep. 30, 2013 Unsecured Credit Facilities | Sep. 30, 2013 Secured Credit Facility | Feb. 11, 2013 Minimum October 2012 Secured Credit Facility | Feb. 11, 2013 Maximum October 2012 Secured Credit Facility | Sep. 30, 2013 Lenders from Original Credit Facility Not Participating in New Credit Facility | Sep. 30, 2013 London Interbank Offered Rate (LIBOR) [Member] February 2013 Secured Credit Facility | Sep. 30, 2013 London Interbank Offered Rate (LIBOR) [Member] October 2012 Secured Credit Facility | Sep. 30, 2013 London Interbank Offered Rate (LIBOR) [Member] Secured 2012 Tranche A-1 Facility Due 2016 | Sep. 30, 2013 London Interbank Offered Rate (LIBOR) [Member] Secured 2012 Tranche A-2 Facility Due 2017 | Sep. 30, 2013 London Interbank Offered Rate (LIBOR) [Member] Minimum February 2013 Secured Credit Facility | Sep. 30, 2013 London Interbank Offered Rate (LIBOR) [Member] Minimum October 2012 Secured Credit Facility | Sep. 30, 2013 London Interbank Offered Rate (LIBOR) [Member] Minimum Secured 2012 Tranche A-1 Facility Due 2016 | Sep. 30, 2013 London Interbank Offered Rate (LIBOR) [Member] Minimum Secured 2012 Tranche A-2 Facility Due 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 1,710,000,000 |  |  |  |  | $ 1,820,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 265,000,000 |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant, minimum collateral coverage, one |  |  |  |  |  |  |  |  |  |  |  | 125.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant, minimum collateral coverage, two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 137.50% | 150.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, collateral, percent of proceeds from principal repayments and sales applied to repayment, one |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, collateral, percent of proceeds from principal repayments and sales applied to repayment, two |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant, minimum collateral coverage, three |  |  |  |  |  |  |  |  |  |  |  | 150.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, lender fees |  |  |  |  |  | 17,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, capitalized lender fees |  |  |  |  |  | 14,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, lender fees, amount recorded in gain (loss) on early extinguishment of debt |  |  |  |  |  | 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, third party fees |  |  |  |  |  | 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, third party fees, amount recognized |  |  |  |  |  | 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, third party fees, amount capitalized |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of REIT taxable income permitted for distribution under debt covenants |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, amount of real estate assets or interests available to distribute |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments under secured credit facilities |  |  | 1,128,904,000 | 603,419,000 |  |  | 230,900,000 |  |  |  | 113,000,000 |  |  |  |  |  |  |  |  | 30,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, unamortized discounts and financing fees |  |  |  |  |  |  |  |  | 25,600,000 |  |  |  | 30,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings on debt instrument |  |  |  |  |  |  |  |  |  |  |  |  |  | 880,000,000 | 410,000,000 |  |  | 470,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tranches |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of par credit facilities were issued at |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98.00% | 98.00% |  | 98.50% | 98.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate, spread |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% | [1] | 4.50% | [2] | 4.00% | [3] | 5.75% | [3] | 1.00% | 1.25% | 1.25% | 1.25%
Repayment of principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 606,700,000 |  | 244,000,000 | 90,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  | 4.50% |  | 4.50% |  |  |  |  |  |  |  |  |  |  |  | 7.00% | 7.00% |  | 5.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum aggregate cumulative amortization payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 41,000,000 | 41,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on early extinguishment of debt, net | 3,498,000 | 3,694,000 | 28,282,000 | 6,858,000 | 2,600,000 |  | 5,100,000 |  |  | 800,000 |  |  |  |  |  | 200,000 | 4,400,000 |  | 800,000 | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  | 9,500,000 | 9,500,000 |  |  |  |  | 4,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Periods following the initial payment of amortization that additional amortization payments are due |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.875% | 3.875% | 4.875% | 4.875% | 8.625% | 8.625% | 5.95% | 5.95% | 5.95% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 96,800,000 |  | 448,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum ratio of unencumbered assets to unsecured indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Multiple of the minimum collateral coverage on outstanding borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate equity value permitted to be distributed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | This loan has a LIBOR floor of 1.00%. As of September 30, 2013, inclusive of the floor, the February 2013 Secured Credit Facility incurred interest at a rate of 4.50%.
[2] | This loan had a LIBOR floor of 1.25%.
[3] | These loans each have a LIBOR floor of 1.25%. As of September 30, 2013, inclusive of the floor, the 2012 Tranche A-2 Facility loan incurred interest at a rate of 7.00%.

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: 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 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=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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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