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Fair Value Measurement Fair Value Inputs, Liabilities, Quantitative Information (Details) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Dec. 31, 2017
Fair Value Disclosures [Abstract] |  |
Adjusted EBITDA Volatility | 25.00% | 26.00%
WACC | 8.25% | 8.75%
20-year risk free rate | 2.91% | 2.58%
Market price of risk | 5.20% | 5.99%
Cost of debt | 4.72% | 4.08%

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- Definition Fair Value Assumptions, Cost of Debt + References No definition available. + Details
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- Definition Fair Value Assumptions, Expected Volatility Rate-Adjusted EBITDA + References No definition available. + Details
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- Definition Risk-free interest rate assumption used in valuing an instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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