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Fair Value Measurement and Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2019
Fair Value Disclosures [Abstract] |
Estimated Fair Values and Related Carrying Values of Financial Instruments | The estimated fair values and related carrying values of the Company’s financial instruments are as follows:
| June 30, 2019 |  | December 31, 2018
In thousands | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
4.375% Senior Notes | $ | 248,952 |  |  | $ | 259,010 |  |  | $ | 248,823 |  |  | $ | 254,218 |
3.45% Senior Notes | $ | 748,396 |  |  | $ | 737,123 |  |  | $ | 748,282 |  |  | $ | 675,075 |
Floating Rate Notes 2021 | $ | 497,396 |  |  | $ | 496,830 |  |  | $ | 496,796 |  |  | $ | 497,425 |
4.15% Senior Notes | $ | 743,638 |  |  | $ | 792,390 |  |  | $ | 742,957 |  |  | $ | 729,350 |
4.7% Senior Notes | $ | 1,240,191 |  |  | $ | 1,349,025 |  |  | $ | 1,239,657 |  |  | $ | 1,179,625 |

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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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