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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2019
Fair Value [Abstract] |
Carrying Values and Fair Values of Debt Instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Carrying Value at | ​ | Fair Value* at | ​
​ | ​ | June 30, | ​ | December 31, | ​ | June 30, | ​ | December 31, | ​
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018 |
5.25% Senior Notes due 2019 | ​ | $ | 175,000 | ​ | $ | 175,000 | ​ | $ | 176,250 | ​ | $ | 177,870 | ​
4.64% Senior Notes due 2021 | ​ | $ | 100,000 | ​ | $ | 100,000 | ​ | $ | 102,936 | ​ | $ | 101,292 | ​
2.39% Senior Notes due 2021 | ​ | $ | 150,000 | ​ | $ | 150,000 | ​ | $ | 148,603 | ​ | $ | 144,305 | ​
3.09% Senior Notes due 2022 | ​ | $ | 125,000 | ​ | $ | 125,000 | ​ | $ | 125,924 | ​ | $ | 120,682 | ​
2.75% Senior Notes due 2023 | ​ | $ | 200,000 | ​ | $ | 200,000 | ​ | $ | 198,899 | ​ | $ | 188,363 | ​
3.24% Senior Notes due 2024 | ​ | $ | 150,000 | ​ | $ | 150,000 | ​ | $ | 152,209 | ​ | $ | 142,877 | ​
3.41% Senior Notes due 2025 | ​ | $ | 375,000 | ​ | $ | 375,000 | ​ | $ | 384,334 | ​ | $ | 355,541 | ​
3.03% Senior Notes due 2026 | ​ | $ | 400,000 | ​ | $ | 400,000 | ​ | $ | 400,776 | ​ | $ | 367,143 | ​
3.49% Senior Notes due 2027 | ​ | $ | 250,000 | ​ | $ | 250,000 | ​ | $ | 257,054 | ​ | $ | 234,243 | ​
4.25% Senior Notes due 2028 | ​ | $ | 500,000 | ​ | $ | 500,000 | ​ | $ | 548,650 | ​ | $ | 506,100 | ​
3.50% Senior Notes due 2029 | ​ | $ | 500,000 | ​ | $ | — | ​ | $ | 519,150 | ​ | $ | — | ​
____________________ *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=118260190&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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