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Retirement Plans (Details Textuals) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Retirements Plans [Line Items]      
Retirement eligible age for participation 55 years    
Years eligible of service for participation 5 years    
Expected long-term rate of return on plan assets 7.50% 7.50%  
Actual return on plan assets percentage 0.43% 5.89%  
Total expense related to 401(k) $ 11.0 $ 11.0 $ 10.0
Fair Value Of Plan Assets As A Percentage Of Net Benefit Obligation 169.00% 177.00%  
Acturial Losses [Member]      
Retirements Plans [Line Items]      
Amounts to be amortized from AOCI next fiscal year $ 1.9    
Equity Securities [Member]      
Retirements Plans [Line Items]      
Plan asset allocation minimum percentage 50.00%    
Plan asset allocation maximum percentage 70.00%    
Debt Securities [Member]      
Retirements Plans [Line Items]      
Plan asset allocation minimum percentage 30.00%    
Plan asset allocation maximum percentage 50.00%    
Cash and Cash Equivalents [Member]      
Retirements Plans [Line Items]      
Plan asset allocation minimum percentage 0.00%    
Plan asset allocation maximum percentage 5.00%    
Cash and Cash Equivalents [Member] | Prior Service Cost [Member]      
Retirements Plans [Line Items]      
Amounts to be amortized from AOCI next fiscal year $ 0.1    
Alternative Securities [Member]      
Retirements Plans [Line Items]      
Plan asset allocation minimum percentage 0.00%    
Plan asset allocation maximum percentage 15.00%    
Pre-65 Health Care Trend Rate [Member]      
Retirements Plans [Line Items]      
Health care trend rate assumption 8.50%    
Defined Benefit Plan, Health Care Cost Trend, Reduction in Trend Rate Minimum 0.25%    
Defined Benefit Plan, Health Care Cost Trend, Reduction in Trend Rate Maximum 0.50%    
Change in assumption 0.5%-0.25% lower in each succeeding year    
Ultimate future rate 5.00%    
Post-65 Health Care Trend [Member]      
Retirements Plans [Line Items]      
Health care trend rate assumption 8.00%    
Defined Benefit Plan, Health Care Cost Trend, Reduction in Trend Rate Minimum 0.25%    
Defined Benefit Plan, Health Care Cost Trend, Reduction in Trend Rate Maximum 0.50%    
Change in assumption 0.5%-0.25% lower in each succeeding year    
Ultimate future rate 5.00%