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Fair Value of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2020
Fair Value [Abstract] |
Carrying Values and Fair Values of Debt Instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Carrying Value at | ​ | Fair Value* at
​ | ​ | September 30, | ​ | December 31, | ​ | September 30, | ​ | December 31,
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019
4.64% Senior Notes due 2021 | ​ | $ | 100,000 | ​ | $ | 100,000 | ​ | $ | 101,590 | ​ | $ | 102,654
2.39% Senior Notes due 2021 | ​ | $ | 150,000 | ​ | $ | 150,000 | ​ | $ | 150,928 | ​ | $ | 149,823
3.09% Senior Notes due 2022 | ​ | $ | 125,000 | ​ | $ | 125,000 | ​ | $ | 128,623 | ​ | $ | 126,884
2.75% Senior Notes due 2023 | ​ | $ | 200,000 | ​ | $ | 200,000 | ​ | $ | 205,995 | ​ | $ | 201,121
3.24% Senior Notes due 2024 | ​ | $ | 150,000 | ​ | $ | 150,000 | ​ | $ | 157,976 | ​ | $ | 153,804
3.41% Senior Notes due 2025 | ​ | $ | 375,000 | ​ | $ | 375,000 | ​ | $ | 402,757 | ​ | $ | 389,127
3.03% Senior Notes due 2026 | ​ | $ | 400,000 | ​ | $ | 400,000 | ​ | $ | 424,805 | ​ | $ | 406,768
3.49% Senior Notes due 2027 | ​ | $ | 250,000 | ​ | $ | 250,000 | ​ | $ | 271,516 | ​ | $ | 259,789
4.25% Senior Notes due 2028 | ​ | $ | 500,000 | ​ | $ | 500,000 | ​ | $ | 600,300 | ​ | $ | 562,050
3.50% Senior Notes due 2029 | ​ | $ | 500,000 | ​ | $ | 500,000 | ​ | $ | 568,850 | ​ | $ | 533,500
2.60% Senior Notes due 2030 | ​ | $ | 600,000 | ​ | $ | — | ​ | $ | 648,060 | ​ | $ | —
3.05% Senior Notes due 2050 | ​ | $ | 500,000 | ​ | $ | — | ​ | $ | 525,200 | ​ | $ | —
____________________ *Senior Notes are classified as Level 2 within the fair value hierarchy. Fair value is based on quotes of bonds with similar ratings in similar industries.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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