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Debt Notes (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |
Notes, net | $ 5,875,328 |  | $ 5,425,346
Repayments of Notes Payable | $ 300,000 | $ 750,000 |
Debt Instrument, Maturity Date Range, End | Jun. 01, 2045 |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum | 0.04% |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum | 7.25% |  |
Notes Payable, Other Payables [Member] |  |  |
Debt Instrument [Line Items] |  |  |
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 | 4.99% |  |
6.584% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Notes Payable | $ 300,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.584% |  |
3.375% Notes [Member] [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.375% |  |
Proceeds from Issuance of Unsecured Debt | $ 450,000 |  |
Proceeds from Debt, Net of Issuance Costs | $ 447,500 |  |
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum | 3.81% |  |
4.50% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.50% |  |
Proceeds from Issuance of Unsecured Debt | $ 300,000 |  |
Proceeds from Debt, Net of Issuance Costs | $ 298,900 |  |
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum | 4.55% |  |

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- Definition When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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