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Investments - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Nov. 30, 2014 | Sep. 30, 2015 | Dec. 31, 2014
Highview Enterprises Limited |  |  |
Investment [Line Items] |  |  |
Ownership interest, percent | 8.00% |  |
Payments to acquire investments | $ 2.8 |  |
Minimum |  |  |
Investment [Line Items] |  |  |
Investment securities, maturities range |  | 1 year |
Maximum |  |  |
Investment [Line Items] |  |  |
Investment securities, maturities range |  | 5 years |
Cost method investment |  |  |
Investment [Line Items] |  |  |
Available-for-sale securities, debt securities |  | $ 2.8 | $ 2.8
Certificates of deposit |  |  |
Investment [Line Items] |  |  |
Investments |  | $ 0.3 | $ 0.3

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