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Debt Debt (Tables) | 12 Months Ended
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Dec. 31, 2014
Debt [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, 2014 and 2013, respectively:
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 |  |  |  |  |  |  |
December 31, 2013 (Amounts in thousands) |  | Net Principal Balance |  | Interest Rate Ranges |  | Weighted Average Interest Rate |  | Maturity Date Ranges
Fixed Rate Public/Private Notes |  | $ | 4,727,088 |  |  | 3.00% - 7.57% |  | 5.55% |  | 2014 - 2026
Floating Rate Public/Private Notes (2) |  | 750,000 |  |  | (2) |  | 1.58% |  | 2015
Totals |  | $ | 5,477,088 |  |  |  |  |  |  |
(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%.
(2) | Includes the Company's senior unsecured $750.0 million term loan facility that was to mature on January 11, 2015 and was paid off in the second quarter of 2014. The interest rate on advances under the term loan facility was generally LIBOR plus a spread (1.20%), which was dependent on the credit rating of the Company's long-term debt.
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 (amounts in thousands):
Year |  | Total (1)
2015 |  | $ | 408,420 |
2016 |  | 1,192,798 |
2017 |  | 1,346,708 |
2018 |  | 514,510 |
2019 |  | 1,278,469 |
Thereafter |  | 6,135,842 |
Net Unamortized (Discount) |  | (31,886 | )
Total |  | $ | 10,844,861 |
(1) | Premiums and discounts are amortized over the life of the debt.

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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 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: 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 3: 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 4: 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 5: 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 6: 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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 8: 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 9: 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 Reference 10: 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 11: 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 + 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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