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Debt Notes (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |
Notes, net | $ 4,360,137 |  | $ 5,848,956
Repayments of Notes Payable | 1,500,000 | $ 0 |
Write Off Of Unamortized Deferred Financing Costs | 1,900 |  |
Write off unamortized premium discount | 25,200 |  |
5.125% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Notes Payable | $ 228,900 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.125% |  |
Prepayment Penalty Charges | $ 1,400 |  |
5.375% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Notes Payable | $ 400,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.375% |  |
Prepayment Penalty Charges | $ 9,500 |  |
5.750% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Notes Payable | $ 255,900 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |  |
Prepayment Penalty Charges | $ 16,500 |  |
7.125% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Notes Payable | $ 46,100 |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.125% |  |
Prepayment Penalty Charges | $ 4,600 |  |
4.625% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Notes Payable | $ 250,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.625% |  |
Prepayment Penalty Charges | $ 31,600 |  |
7.570% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Notes Payable | $ 48,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.57% |  |
Prepayment Penalty Charges | $ 19,300 |  |
Notes Payable, Other Payables [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Maturity Date | Jun. 01, 2045 |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum | 2.375% |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum | 7.57% |  |
Weighted Average Interest Rate | 4.62% |  |
Paid at Maturity [Member] | 5.125% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Notes Payable | $ 271,100 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.125% |  |

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