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Fair Value Measurement and Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 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:
| March 31, 2019 |  | December 31, 2018
In thousands | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
4.375% Senior Notes | 248,888 |  |  | 250,108 |  |  | 248,823 |  |  | 254,218 |
3.45% Senior Notes | 748,339 |  |  | 698,258 |  |  | 748,282 |  |  | 675,075 |
Floating Rate Notes 2021 | 497,096 |  |  | 500,495 |  |  | 496,796 |  |  | 497,425 |
4.15% Senior Notes | 743,298 |  |  | 762,870 |  |  | 742,957 |  |  | 729,350 |
4.7% Senior Notes | 1,239,924 |  |  | 1,267,750 |  |  | 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=109250915&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=99377789&loc=d3e19207-110258 + Details
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