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Summary of Significant Accounting Policies:Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Reported Value Measurement [Member] | 5.625% Senior Notes Due 2024 [Member] |  |
Financial Instruments |  |
Fixed-rate debt | $ 350.0 | $ 350.0
Level 2 [Member] | Estimate of Fair Value Measurement [Member] | 5.625% Senior Notes Due 2024 [Member] |  |
Financial Instruments |  |
Fixed-rate debt | 369.3 | 347.4
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Money Market Funds [Member] |  |
Financial Instruments |  |
Cash equivalents, fair value | $ 137.5 | $ 78.1

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value portion of notes payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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