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Summary of Significant Accounting Policies (Deferred Softward Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Deferred software costs | $ 16.4 | $ 15.8 |
Capitalized Computer Software, Amortization | $ 6.3 | $ 4.4 | $ 2.9
Minimum | Software Development [Member] |  |  |
Useful lives | 18 months |  |
Maximum | Software Development [Member] |  |  |
Useful lives | 36 months |  |
Maximum | Software and Software Development Costs [Member] |  |  |
Useful lives | 5 years |  |

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