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Debt (Tables) | 12 Months Ended
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Dec. 31, 2015
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments [Table Text Block] | The following tables summarize the Company’s unsecured note balances and certain interest rate and maturity date information as of and for the years ended December 31, 2015 and 2014, respectively:
December 31, 2015 (Amounts in thousands) |  | Net Principal Balance |  | Interest Rate Ranges |  | Weighted Average Interest Rate |  | Maturity Date Ranges
Fixed Rate Public Notes (1) |  | $ | 5,423,012 |  |  | 3.00% - 7.57% |  | 5.30% |  | 2016 - 2045
Floating Rate Public Notes (1) |  | 453,340 |  |  | (1) |  | 0.93% |  | 2019
Totals |  | $ | 5,876,352 |  |  |  |  |  |  |
December 31, 2014 (Amounts in thousands) |  | Net Principal Balance |  | Interest Rate Ranges |  | Weighted Average Interest Rate |  | Maturity Date Ranges
Fixed Rate Public Notes (1) |  | $ | 4,974,154 |  |  | 3.00% - 7.57% |  | 5.45% |  | 2015 - 2044
Floating Rate Public Notes (1) |  | 451,192 |  |  | (1) |  | 1.15% |  | 2019
Totals |  | $ | 5,425,346 |  |  |  |  |  |  |
(1) | Fair value interest rate swaps convert the $450.0 million 2.375% notes due July 1, 2019 to a floating interest rate of 90-Day LIBOR plus 0.61%.
Aggregate payments of principal on unsecured notes payable | The following table provides a summary of the aggregate payments of principal on all debt for each of the next five years and thereafter as of December 31, 2015 (amounts in thousands):
Year |  | Total (1)
2016 |  | $ | 1,352,813 |
2017 |  | 1,347,846 |
2018 |  | 180,461 |
2019 |  | 1,281,127 |
2020 |  | 1,679,432 |
Thereafter |  | 5,173,079 |
Net Unamortized (Discount) |  | (46,260 | )
Total |  | $ | 10,968,498 |
(1) | Premiums and discounts are amortized over the life of the debt. See Note 18 for discussion of the debt amounts repaid subsequent to December 31, 2015.

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 9: 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 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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