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Secured and Unsecured Debt (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($)
Secured debt instruments |  |  |
Weighted average interest rate | 3.58% |  |
Long-term Debt | $ 3,564,403 | $ 3,564,403 | $ 3,583,105
Unsecured Debt | 2,213,964 | $ 2,213,964 | 2,221,576
Weighted Average Years to Maturity |  | 4 years 29 days |
Line of Credit Facility, Amount Outstanding | 2,300 | $ 2,300 | 1,900
Fixed Rate Debt [Member] |  |  |
Secured debt instruments |  |  |
Principal outstanding | $ 975,024 | $ 975,024 | 969,296
Weighted average interest rate | 5.28% |  |
Weighted Average Years to Maturity |  | 2 years 6 months 10 days |
Number of Communities Encumbered | 28 |  |
Variable Rate Debt [Member] |  |  |
Secured debt instruments |  |  |
Principal outstanding | $ 375,415 | $ 375,415 | 392,233
Weighted average interest rate | 1.45% |  |
Weighted Average Years to Maturity |  | 5 years 3 months |
Number of Communities Encumbered | 10 |  |
Mortgages Notes Payable [Member] | Fixed Rate Debt [Member] |  |  |
Secured debt instruments |  |  |
Weighted average interest rate | 5.50% |  |
Weighted Average Years to Maturity |  | 1 year 20 days |
Number of Communities Encumbered | 7 |  |
Mortgages Notes Payable [Member] | Variable Rate Debt [Member] |  |  |
Secured debt instruments |  |  |
Weighted average interest rate | 1.94% |  |
Weighted Average Years to Maturity |  | 1 year 6 months 25 days |
Number of Communities Encumbered | 1 |  |
Tax-exempt secured notes payable [Member] | Variable Rate Debt [Member] |  |  |
Secured debt instruments |  |  |
Weighted average interest rate | 0.84% |  |
Weighted Average Years to Maturity |  | 7 years 8 months 8 days |
Number of Communities Encumbered | 2 |  |
Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member] |  |  |
Secured debt instruments |  |  |
Debt, Weighted Average Interest Rate | 5.12% | 5.12% |
Weighted Average Years to Maturity |  | 3 years 6 months 14 days |
Number of Communities Encumbered | 21 |  |
Fannie Mae credit facilities [Member] | Variable Rate Debt [Member] |  |  |
Secured debt instruments |  |  |
Debt Instrument, Interest Rate at Period End | 1.63% | 1.63% |
Weighted Average Years to Maturity |  | 4 years 9 months 10 days |
Number of Communities Encumbered | 7 |  |
Secured Debt [Member] |  |  |
Secured debt instruments |  |  |
Principal outstanding | $ 1,350,439 | $ 1,350,439 | 1,361,529
Weighted average interest rate | 4.22% |  |
Long-term Debt | $ 1,350,439 | $ 1,350,439 |
Weighted Average Years to Maturity |  | 3 years 3 months 18 days |
Number of Communities Encumbered | 38 |  |
Secured Debt [Member] | Fixed Rate Debt [Member] |  |  |
Secured debt instruments |  |  |
Long-term Debt | $ 975,024 | $ 975,024 |
Secured Debt [Member] | Variable Rate Debt [Member] |  |  |
Secured debt instruments |  |  |
Long-term Debt | $ 375,415 | $ 375,415 |
Unsecured Revolving Credit Facility due October 2015 [Member] |  |  |
Secured debt instruments |  |  |
Weighted average interest rate | 1.12% |  |
Weighted Average Years to Maturity |  | 2 years 5 months 4 days |
Line of Credit Facility, Amount Outstanding | $ 457,000 | $ 457,000 | 152,500
ThreePointSevenTermNotesDueOctober2020 [Member] |  |  |
Secured debt instruments |  |  |
Weighted average interest rate |  | 3.70% |
Senior Notes | $ 299,958 | $ 299,958 | 299,954
Weighted Average Years to Maturity |  | 5 years 3 months |
Four Point Six Three Percent Term Medium Notes Due January Two Thousand Twenty-Two [Member] |  |  |
Secured debt instruments |  |  |
Weighted average interest rate | 4.63% |  |
Senior Notes | $ 397,656 | $ 397,656 | 397,477
Weighted Average Years to Maturity |  | 6 years 6 months 10 days |
3.75 MTN Due July 2024 [Member] |  |  |
Secured debt instruments |  |  |
Weighted average interest rate | 3.75% |  |
Senior Notes | $ 299,062 | $ 299,062 | 299,010
Weighted Average Years to Maturity |  | 9 years |
1.67% Term Notes due December 2016 [Member] |  |  |
Secured debt instruments |  |  |
Weighted average interest rate |  | 1.33% |
Senior Notes | 35,000 | $ 35,000 | 35,000
Weighted Average Years to Maturity |  | 2 years 11 months 1 day |
2.68% Term Notes due December 2016 [Member] |  |  |
Secured debt instruments |  |  |
Weighted average interest rate |  | 1.53% |
Senior Notes | 100,000 | $ 100,000 | 100,000
Weighted Average Years to Maturity |  | 2 years 11 months 4 days |
Five Point Two Five Percent, Medium Term Notes, Due January 2015 [Member] |  |  |
Secured debt instruments |  |  |
Weighted average interest rate |  | 0.00% |
Senior Notes | 0 | $ 0 | 325,169
Weighted Average Years to Maturity |  |  |
Five Point Two Five Percent, Medium Term Notes, Due January 2016 [Member] |  |  |
Secured debt instruments |  |  |
Weighted average interest rate |  | 5.25% |
Senior Notes | 83,260 | $ 83,260 | 83,260
Weighted Average Years to Maturity |  | 6 months 14 days |
6.21 Medium Term Note, Due January 2016 [Member] |  |  |
Secured debt instruments |  |  |
Weighted average interest rate |  | 6.21% |
Senior Notes | 12,609 | $ 12,609 | 0
Weighted Average Years to Maturity |  | 1 year 3 days |
2.90% Term Notes due January 2016 [Member] |  |  |
Secured debt instruments |  |  |
Weighted average interest rate |  | 1.70% |
Senior Notes | $ 215,000 | $ 215,000 | 215,000
Weighted Average Years to Maturity |  | 2 years 11 months 4 days |
Eight Point Five Zero Percent, Debentures, Due September 2024 [Member] |  |  |
Secured debt instruments |  |  |
Weighted average interest rate | 8.50% |  |
Senior Notes | $ 15,644 | $ 15,644 | 15,644
Weighted Average Years to Maturity |  | 9 years 2 months 15 days |
Four Point Two Five Percentage Medium-Term Notes due June 2018 [Member] |  |  |
Secured debt instruments |  |  |
Weighted average interest rate |  | 4.25% |
Senior Notes | 298,749 | $ 298,749 | 298,535
Weighted Average Years to Maturity |  | 2 years 11 months 1 day |
Other [Member] |  |  |
Secured debt instruments |  |  |
Senior Notes | $ 26 | $ 26 | 27
Unsecured Debt [Member] |  |  |
Secured debt instruments |  |  |
Weighted average interest rate | 3.20% |  |
Long-term Debt | $ 2,213,964 | 2,213,964 |
Unsecured Debt | 2,213,964 | $ 2,213,964 | 2,221,576
Weighted Average Years to Maturity |  | 4 years 6 months 21 days |
Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mortgages Notes Payable [Member] | Mortgages Notes Payable [Member] | Fixed Rate Debt [Member] |  |  |
Secured debt instruments |  |  |
Principal outstanding | 408,736 | $ 408,736 | 401,210
Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mortgages Notes Payable [Member] | Mortgages Notes Payable [Member] | Variable Rate Debt [Member] |  |  |
Secured debt instruments |  |  |
Principal outstanding | 31,337 | 31,337 | 31,337
Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fannie Mae credit facilities [Member] | Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member] |  |  |
Secured debt instruments |  |  |
Principal outstanding | 566,288 | 566,288 | 568,086
Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fannie Mae credit facilities [Member] | Fannie Mae credit facilities [Member] | Variable Rate Debt [Member] |  |  |
Secured debt instruments |  |  |
Principal outstanding | $ 249,378 | $ 249,378 | $ 266,196

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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