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Recently Issued Accounting Standards Recently Issued Accounting Standards (Details) - USD ($) | Sep. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Change in accounting principle | [1] |  |  | $ 4,113,000 |
Restricted cash |  | $ 0 |  |  | $ 75,000,000
Accounting Standards Update 2016-01 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Change in accounting principle |  |  | $ 4,100,000 |  |
[1] | Related to adoption of ASU No. 2016-01. See Notes K and S for additional information.

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