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Fair Value Measurements and Derivative Instruments - Credit Features (Details) | 3 Months Ended
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Mar. 31, 2018 derivative
Derivative Instruments |
Number of derivatives matured | 4
Moody's, Baa3 Rating |
Derivative Instruments |
Credit ratings for senior debt | Baa3
Standard & Poor's, BBB- Rating | Minimum |
Derivative Instruments |
Credit ratings for senior debt | BBB-

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- Definition Description of the credit rating indicative of likelihood of repayment of the debt instrument given by a credit rating agency (for example, Standard and Poor's, Moody's, Fitch). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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