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v3.6.0.2

Debt Notes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |
Proceeds from Issuance of Unsecured Debt |  |  | $ 750,000
Repayments of Notes Payable | $ 1,500,000 | $ 300,000 | $ 1,250,000
Summary of Company's unsecured note balances and certain interest rate and maturity date information |  |  |
Notes, net | 4,848,079 | 5,848,956 |
Fixed Rate Public or Private Notes [Member] |  |  |
Summary of Company's unsecured note balances and certain interest rate and maturity date information |  |  |
Notes, net | $ 4,397,829 | $ 5,397,552 |
Weighted Average Interest Rate | 4.90% | 5.30% |
Debt Instrument, Maturity Date Range, Start | Jan. 01, 2017 | Jan. 01, 2016 |
Debt Instrument, Maturity Date Range, End | Dec. 31, 2045 | Dec. 31, 2045 |
Floating Rate Public or Private Notes [Member] |  |  |
Summary of Company's unsecured note balances and certain interest rate and maturity date information |  |  |
Notes, net | $ 450,250 | $ 451,404 |
Weighted Average Interest Rate | 1.28% | 0.93% |
Debt Instrument, Maturity Date Range, Start | Jan. 01, 2019 | Jan. 01, 2019 |
Debt Instrument, Maturity Date Range, End | Dec. 31, 2019 | Dec. 31, 2019 |
2.375% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from Issuance of Unsecured Debt | $ 450,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.375% |  |
Debt Instrument, Basis Spread on Variable Rate | 0.61% |  |
5.125% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.125% |  |
Repayments of Notes Payable | $ 228,900 |  |
Prepayment penalty charges | $ 1,400 |  |
5.375% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.375% |  |
Repayments of Notes Payable | $ 400,000 |  |
Prepayment penalty charges | $ 9,500 |  |
5.750% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |  |
Repayments of Notes Payable | $ 255,900 |  |
Prepayment penalty charges | $ 16,500 |  |
7.125% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.125% |  |
Repayments of Notes Payable | $ 46,100 |  |
Prepayment penalty charges | $ 4,600 |  |
4.625% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.625% |  |
Repayments of Notes Payable | $ 250,000 |  |
Prepayment penalty charges | $ 31,600 |  |
7.570% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.57% |  |
Repayments of Notes Payable | $ 48,000 |  |
Prepayment penalty charges | 19,300 |  |
2.85% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from Issuance of Unsecured Debt | $ 500,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.85% |  |
Proceeds from Debt, Net of Issuance Costs | $ 496,700 |  |
Debt Instrument, Interest Rate, Effective Percentage | 3.10% |  |
Unsecured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Write off of Deferred Debt Issuance Cost | $ 1,900 |  |
Write off unamortized (premium) discount | 25,200 |  |
6.584% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.584% |
Repayments of Notes Payable |  | $ 300,000 |
3.375% Notes [Member] [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from Issuance of Unsecured Debt | $ 450,000 | $ 450,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.375% |
Proceeds from Debt, Net of Issuance Costs |  | $ 447,500 |
Debt Instrument, Interest Rate, Effective Percentage |  | 3.81% |
4.50% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from Issuance of Unsecured Debt |  | $ 300,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.50% |
Proceeds from Debt, Net of Issuance Costs |  | $ 298,900 |
Debt Instrument, Interest Rate, Effective Percentage |  | 4.55% |
Paid at Maturity [Member] | 5.125% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.125% |  |
Repayments of Notes Payable | $ 271,100 |  |
London Interbank Offered Rate (LIBOR) [Member] | 2.375% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Description of Variable Rate Basis | LIBOR plus 0.61% |  |
Minimum [Member] | Fixed Rate Public or Private Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.85% | 3.00% |
Maximum [Member] | Fixed Rate Public or Private Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.57% | 7.57% |

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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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 + Details
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