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Notes Payable (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2016 | Sep. 30, 2016 | Nov. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Debt instrument |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  | $ 3,975,000 | $ 3,650,000 |
Unamortized original issuance discounts and deferred financing costs |  |  |  |  |  | (41,000) | (32,000) |
Notes payable, net |  |  |  |  |  | 3,934,433 | 3,617,973 |
Principal payments on notes payable |  |  |  |  |  | 275,000 | 150,000 |
Proceeds from issuance of debt |  |  |  |  |  |  | $ 250,000 |
Maturity of notes and bonds payable |  |  |  |  |  |  |  |
2017 |  |  |  |  |  | 175,000 |  |
2018 |  |  |  |  |  | 350,000 |  |
2019 |  |  |  |  |  | 550,000 |  |
2021 |  |  |  |  |  | 250,000 |  |
Thereafter |  |  |  |  |  | 2,650,000 |  |
Totals |  |  |  |  |  | $ 3,975,000 |  |
Minimum |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 2.40% | 2.00% |
Effective yield (as a percent) |  |  |  |  |  | 2.50% | 2.20% |
Maximum |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 6.90% | 6.90% |
Effective yield (as a percent) |  |  |  |  |  | 8.80% | 8.90% |
5.950% notes, issued in September 2006 and due in September 2016 |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  |  | $ 275,000 |
Interest rate (as a percent) |  | 5.95% |  |  |  | 5.95% | 5.95% |
Principal payments on notes payable |  | $ 275,000 |  |  |  |  |  |
5.375% notes, issued in September 2005 and due in September 2017 |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  | $ 175,000 | $ 175,000 |
Interest rate (as a percent) |  |  |  |  |  | 5.375% | 5.375% |
2.000% notes, issued in October 2012 and due in January 2018 |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  | $ 350,000 | $ 350,000 |
Interest rate (as a percent) |  |  |  |  |  | 2.00% | 2.00% |
6.750% notes, issued in September 2007 and due in August 2019 |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  | $ 550,000 | $ 550,000 |
Interest rate (as a percent) |  |  |  |  |  | 6.75% | 6.75% |
5.750% notes, issued in June 2010 and due in January 2021 |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  | $ 250,000 | $ 250,000 |
Interest rate (as a percent) |  |  |  |  |  | 5.75% | 5.75% |
3.250% notes, issued in October 2012 and due in October 2022 |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  | $ 450,000 | $ 450,000 |
Interest rate (as a percent) |  |  |  |  |  | 3.25% | 3.25% |
4.650% notes, issued in July 2013 and due in August 2023 |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  | $ 750,000 | $ 750,000 |
Interest rate (as a percent) |  |  |  |  |  | 4.65% | 4.65% |
3.875% notes, issued in June 2014 and due in July 2024 |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  | $ 350,000 | $ 350,000 | $ 350,000 |
Interest rate (as a percent) |  |  |  |  | 3.875% | 3.875% | 3.875% |
Percentage price paid to the investor |  |  |  |  | 99.956% |  |  |
Effective yield (as a percent) |  |  |  |  | 3.88% |  |  |
Proceeds from issuance of debt |  |  |  |  | $ 346,700 |  |  |
4.125% notes, issued in September 2014 and due in October 2026 |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Total principal amount |  |  |  | $ 250,000 |  | $ 250,000 | $ 250,000 |
Interest rate (as a percent) |  |  |  | 4.125% |  | 4.125% | 4.125% |
Percentage price paid to the investor |  |  |  | 99.499% |  |  |  |
Effective yield (as a percent) |  |  |  | 4.178% |  |  |  |
Proceeds from issuance of debt |  |  |  | $ 246,400 |  |  |  |
3.000% notes, issued in October 2016 and due in January 2027 |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Total principal amount | $ 600,000 |  |  |  |  | $ 600,000 |  |
Interest rate (as a percent) | 3.00% |  |  |  |  | 3.00% |  |
Percentage price paid to the investor | 98.671% |  |  |  |  |  |  |
Effective yield (as a percent) | 3.153% |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 586,700 |  |  |  |  |  |  |
5.875% bonds, $100 issued in March 2005 and $150 issued in June 2011, both due in March 2035 |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  | $ 250,000 | $ 250,000 |
Interest rate (as a percent) |  |  |  |  |  | 5.875% | 5.875% |
5.875% bonds, issued in March 2005 and due in March 2035 |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  | $ 100 | $ 100 |
5.875% bonds, issued in June 2011 and due in March 2035 |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  | $ 150 | 150 |
Notes and bonds payable |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  | 4.40% |  |
Weighted average remaining years until maturity |  |  |  |  |  | 6 years 7 months 6 days |  |
Interest incurred on notes and bonds |  |  |  |  |  | $ 171,500 | $ 179,500 | $ 166,500
Notes and bonds payable | Minimum |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Debt service coverage ratio |  |  |  |  |  | 1.5 |  |
Total unencumbered assets as a percentage of outstanding unsecured debt |  |  |  |  |  | 150.00% |  |
Notes and bonds payable | Maximum |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Debt to total adjusted assets ratio (as a percent) |  |  |  |  |  | 60.00% |  |
Secured debt to total adjusted assets ratio (as a percent) |  |  |  |  |  | 40.00% |  |
5.5% notes, issued in November 2003 and due in November 2015 |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 5.50% |  |  |  |  |
Principal payments on notes payable |  |  | $ 150,000 |  |  |  |  |

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