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Executive Deferred Compensation Plan (Details) - Executive [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Executive Deferred Compensation Plan [Abstract] |  |  |
Percentage of matching contribution maximum | 10.00% |  |
Percentage of compensation deferred, maximum | 80.00% |  |
Percentage of bonus deferred, maximum | 100.00% |  |
Percentage vested after ten years of service | 50.00% |  |
Number of years of service to attain fifty percent vesting | 10 years |  |
Percentage vested per year after ten years of service | 5.00% |  |
Minimum age for unvested company contributions to fully vest | 60 years |  |
Compensation expense | $ 1.5 | $ 1.5 | $ 2.3
Long-term deferred compensation liability | 43.2 | 36.7 |
Investment in Rabbi Trust | $ 37.7 | $ 32.3 |

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