Long-Term Debt (Summary of Redemption Dates and Prices of Senior Notes) (Parenthetical) (Details) - Senior Notes, maturing 2023 [Member]	3 Months Ended
Mar. 31, 2017
Period from April 15, 2019 to April 14, 2020 [Member]
Debt Instrument Redemption [Line Items]
Debt Instrument, Redemption Period, Start Date	Apr. 15, 2019
Debt Instrument, Redemption Period, End Date	Apr. 14, 2020
Period from April 15, 2020 to April 14, 2021 [Member]
Debt Instrument Redemption [Line Items]
Debt Instrument, Redemption Period, Start Date	Apr. 15, 2020
Debt Instrument, Redemption Period, End Date	Apr. 14, 2021
Period from April 15, 2021 to April 14, 2022 [Member]
Debt Instrument Redemption [Line Items]
Debt Instrument, Redemption Period, Start Date	Apr. 15, 2021
Debt Instrument, Redemption Period, End Date	Apr. 14, 2022
Period from April 15, 2022 to April 14, 2023 [Member]
Debt Instrument Redemption [Line Items]
Debt Instrument, Redemption Period, Start Date	Apr. 15, 2022
Debt Instrument, Redemption Period, End Date	Apr. 14, 2023

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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End date of debt instrument redemption period, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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Start date of debt instrument redemption period, in CCYY-MM-DD format.

+ References

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