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Debt - Notes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |
Shelf registration statement effective date | Jun. 28, 2016 |  |
Shelf registration statement expiry date | Jun. 28, 2019 |  |
Repayments of notes payable |  | $ 497,975 | $ 1,500,000
3.50% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from issuance of unsecured debt | $ 500,000 |  |
Debt instrument, interest rate, stated percentage | 3.50% |  |
Proceeds from debt, net of issuance costs | $ 497,000 |  |
Debt instrument, interest rate, effective percentage | 3.61% |  |
4.15% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from issuance of unsecured debt | $ 400,000 |  |
Debt instrument, interest rate, stated percentage | 4.15% |  |
Proceeds from debt, net of issuance costs | $ 399,300 |  |
Debt instrument, interest rate, effective percentage | 3.85% |  |
5.75 % Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate, stated percentage |  | 5.75% |
Repayments of notes payable |  | $ 394,100 |
7.125% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate, stated percentage |  | 7.125% |
Repayments of notes payable |  | $ 103,900 |
3.25% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from issuance of unsecured debt |  | $ 400,000 |
Debt instrument, interest rate, stated percentage |  | 3.25% |
Proceeds from debt, net of issuance costs |  | $ 399,300 |
Debt instrument, interest rate, effective percentage |  | 3.32% |
4.00% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from issuance of unsecured debt |  | $ 300,000 |
Debt instrument, interest rate, stated percentage |  | 4.00% |
Proceeds from debt, net of issuance costs |  | $ 293,200 |
Debt instrument, interest rate, effective percentage |  | 4.11% |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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