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Benefit Plans (Details Textual) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) plan | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Retirement Benefits [Abstract] |  |  |
Employer discretionary contribution amount | $ 4.9 | $ 4.4 | $ 3.8
Number of non-contributory defined benefit pension plans | plan | 2 |  |
Period of average compensation for pension benefit computation | 5 years |  |
Age limit for a lump sum payment | 55 years |  |
Deferred compensation arrangement with Individual, recorded liability | $ 8.0 |  |
Long-term portion of the pension liability | 32.4 | 28.3 |
AOCI net prior service cost | 5.1 |  |
Future amortization of prior service cost | $ 0.5 |  |
Retirement age | 65 years |  |
Rabbi trust balance | $ 21.0 |  |
Expense related to contributions | 0.1 |  |
Total deferred compensation liability | 21.0 | 16.0 |
Deferred compensation liability, current | $ 1.4 | $ 0.8 |

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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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