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Benefit Plans (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 Y noncontributory_defined_benefit_pension_plans | Dec. 31, 2012 | Jan. 01, 2012
Compensation and Retirement Disclosure [Abstract] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 3.4 | $ 4.1 | $ 3.0
Number of Non-Contributory Defined Benefit Pension Plans | 2 |  |
Period of average compensation for pension benefit computation | 5 years |  |
Age limit for a lump sum payment | 55 |  |
Deferred Compensation Arrangement with Individual, Recorded Liability | 6.8 |  |
Long-term portion of the pension liability | 19.8 | 19.5 |
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost (Credit), after Tax | 1.7 |  |
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit) | 0.3 |  |
Retirement age | 65 |  |
Total deferred compensation liability | 9.8 | 8.0 |
Deferred Compensation Liability, Current | 0.3 | 1.1 |
Expense related to contributions | $ 0.2 | $ 0.4 | $ 0.3

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- Definition Minimum age to be eligible to receive lump sum payment upon benefit. + References No definition available. + Details
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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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- Definition This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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