New Accounting Pronouncements New Accounting Pronouncements (Details) - USD ($) $ in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2018 |
Dec. 31, 2017 |
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| New Accounting Pronouncements [Abstract] | ||
| Deferred lease costs amount related to salaries and related costs | $ 2.8 | $ 6.1 |
| X | ||||||||||
- Definition Deferred lease costs amount related to salaries and related costs No definition available.
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| X | ||||||||||
- Definition New Accounting Pronouncements [Abstract] No definition available.
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