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Debt Obligations, net (Schedule of Debt) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Aug. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt obligations |  | $ 3,780,669,000 |  | $ 3,780,669,000 |  |  |  |  | $ 4,150,389,000
Debt discounts and deferred financing costs, net |  | (30,796,000) |  | (30,796,000) |  |  |  |  | (31,566,000)
Total debt obligations, net |  | 3,749,873,000 |  | 3,749,873,000 |  |  |  |  | 4,118,823,000
Interest costs capitalized |  | 1,400,000 | $ 1,300,000 | 4,200,000 | $ 4,000,000 |  |  |  |
2015 $250 Million Secured Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | 250,000,000 |  | 250,000,000 |  |  |  |  |
Total debt obligations |  | 0 |  | $ 0 |  |  |  |  | 250,000,000
Converted term loan, term |  |  |  | 1 year |  |  |  |  |
2015 $250 Million Secured Revolving Credit Facility | Minimum | Interest Rate Category One |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, margin |  |  |  | 1.25% |  |  |  |  |
2015 $250 Million Secured Revolving Credit Facility | Minimum | Interest Rate Category Two |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, margin |  |  |  | 2.25% |  |  |  |  |
2015 $250 Million Secured Revolving Credit Facility | Maximum | Interest Rate Category One |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, margin |  |  |  | 1.75% |  |  |  |  |
2015 $250 Million Secured Revolving Credit Facility | Maximum | Interest Rate Category Two |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, margin |  |  |  | 2.75% |  |  |  |  |
2015 $250 Million Secured Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Variable interest rate, spread |  |  |  | 2.75% |  |  |  |  |
2015 $250 Million Secured Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Variable interest rate, spread |  |  |  | 1.00% |  |  |  |  |
2015 $250 Million Secured Revolving Credit Facility | Federal Funds Effective Swap Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Variable interest rate, spread |  |  |  | 0.50% |  |  |  |  |
2016 Senior Secured Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 500,000,000.0 | $ 450,000,000.0 |  |
Total debt obligations |  | 499,976,000 |  | $ 499,976,000 |  |  |  |  | 0
Variable interest rate, spread |  |  |  | 1.00% |  |  |  |  |
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Variable interest rate, spread |  |  |  | 4.50% |  |  |  |  |
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Variable interest rate, spread |  |  |  | 1.00% |  |  |  |  |
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Variable interest rate, spread |  |  |  | 3.50% |  |  |  |  |
2016 Senior Secured Credit Facility | Federal Funds Effective Swap Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Variable interest rate, spread |  |  |  | 0.50% |  |  |  |  |
Mortgages collateralized by net lease assets |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt obligations |  | $ 232,721,000 |  | $ 232,721,000 |  |  |  |  | 239,547,000
Stated interest rate, minimum |  |  |  | 4.85% |  |  |  |  |
Stated interest rate, maximum |  |  |  | 7.26% |  |  |  |  |
Weighted average interest rate |  | 5.20% |  | 5.20% |  |  |  |  |
Mortgages collateralized by net lease assets | London Interbank Offered Rate (LIBOR) | Property One |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Variable interest rate, spread |  |  |  | 2.00% |  |  |  |  |
2012 Secured Tranche A-2 Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 470,000,000 |  |  |  |  |  |  |  |
Total debt obligations |  | $ 0 |  | $ 0 |  |  |  |  | 339,717,000
Variable interest rate, spread | 5.75% |  |  |  |  |  |  |  |
2012 Secured Tranche A-2 Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Variable interest rate, spread |  |  |  | 5.75% |  |  |  |  |
2012 Secured Tranche A-2 Facility | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Variable interest rate, spread | 1.25% |  |  |  |  |  |  |  |
Total secured credit facilities and mortgages |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt obligations |  | 732,697,000 |  | $ 732,697,000 |  |  |  |  | 829,264,000
5.875% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt obligations |  | $ 0 |  | $ 0 |  |  |  |  | 261,403,000
Stated Interest Rates |  | 5.875% |  | 5.875% |  |  |  | 5.875% |
3.875% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt obligations |  | $ 0 |  | $ 0 |  |  |  |  | 265,000,000
Stated Interest Rates |  | 3.875% |  | 3.875% |  |  |  |  |
3.00% senior convertible notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt obligations |  | $ 200,000,000 |  | $ 200,000,000 |  |  |  |  | 200,000,000
Stated Interest Rates |  | 3.00% |  | 3.00% |  |  |  |  |
Convertible debt conversion ratio |  |  |  | 0.085 |  |  |  |  |
Convertible debt conversion price (usd per share) |  | $ 11.77 |  | $ 11.77 |  |  |  |  |
1.50% senior convertible notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt obligations |  | $ 178,250,000 |  | $ 178,250,000 |  |  |  |  | 200,000,000
Stated Interest Rates |  | 1.50% |  | 1.50% |  |  |  |  |
Convertible debt conversion ratio |  |  |  | 0.0578 |  |  |  |  |
Convertible debt conversion price (usd per share) |  | $ 17.29 |  | $ 17.29 |  |  |  |  |
5.85% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt obligations |  | $ 99,722,000 |  | $ 99,722,000 |  |  |  |  | 99,722,000
Stated Interest Rates |  | 5.85% |  | 5.85% |  |  |  |  |
9.00% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt obligations |  | $ 275,000,000 |  | $ 275,000,000 |  |  |  |  | 275,000,000
Stated Interest Rates |  | 9.00% |  | 9.00% |  |  |  |  |
4.00% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt obligations |  | $ 550,000,000 |  | $ 550,000,000 |  |  |  |  | 550,000,000
Stated Interest Rates |  | 4.00% |  | 4.00% |  |  |  |  |
7.125% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt obligations |  | $ 300,000,000 |  | $ 300,000,000 |  |  |  |  | 300,000,000
Stated Interest Rates |  | 7.125% |  | 7.125% |  |  |  |  |
4.875% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt obligations |  | $ 300,000,000 |  | $ 300,000,000 |  |  |  |  | 300,000,000
Stated Interest Rates |  | 4.875% |  | 4.875% |  |  |  |  |
5.00% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt obligations |  | $ 770,000,000 |  | $ 770,000,000 |  |  |  |  | 770,000,000
Stated Interest Rates |  | 5.00% |  | 5.00% |  |  |  |  |
6.50% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt obligations |  | $ 275,000,000 |  | $ 275,000,000 |  |  |  |  | 0
Stated Interest Rates |  | 6.50% |  | 6.50% |  |  |  | 6.50% |
Unsecured Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt obligations |  | $ 2,947,972,000 |  | $ 2,947,972,000 |  |  |  |  | 3,221,125,000
Trust preferred securities |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt obligations |  | $ 100,000,000 |  | $ 100,000,000 |  |  |  |  | $ 100,000,000
Variable interest rate, spread |  |  |  | 1.50% |  |  |  |  |

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