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Benefit Plans (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
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