Business and Summary of Significant Accounting Principles (Basis of Presentation and Principles of Consolidation) (Details) - entity |
12 Months Ended | |
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Dec. 31, 2017 |
Feb. 02, 2015 |
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| Business Acquisition [Line Items] | ||
| Number of VIEs | 7 | |
| AWN | ||
| Business Acquisition [Line Items] | ||
| Percentage of voting interests acquired | 33.33% | |
| AWN | ||
| Business Acquisition [Line Items] | ||
| Ownership percentage | 66.67% |
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- Definition Variable Interest Entity, Number Of Entities No definition available.
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- Definition 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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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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