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Employee Benefit Plans (Narrative) (Details)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
N
shares
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation $ 62.3 $ 61.9  
Increase (decrease) in annual rate per capita cost of covered healthcare benefits, next year 9.00%    
Increase (decrease) in annual rate per capita cost of covered healthcare benefits, 2017-2019 1.00%    
Increase (decrease) in annual rate per capita cost of covered healthcare benefits, 2020-2021 0.50%    
Annual rate of increase in the per capita cost of covered healthcare benefits 5.00%    
Description of 401(k) The Company has a 401(k) defined contribution plan, which covers substantially all employees with more than 1,000 hours of service. Under the terms of the Plan, the Company matches 100% of a participant’s contributions, which do not exceed 1% of a participant’s compensation, plus 50% of a participant’s contributions exceeding 1%, but not more than 6%. The Company’s matching contributions were $0.6 million, $0.6 million and $0.5 million for the years ended December 31, 2015, 2014 and 2013, respectively. For those employees hired after March 31, 2007 and still actively employed on December 31, 2015, the Company approved and will fund discretionary contribution of $0.4 million, which was based on 5.0% of eligible 2014 compensation. For the years ended December 31, 2013 and 2012, the Company made discretionary contributions of $0.3 million and $0.3 million, respectively, for those qualifying employees.    
Number of hours required to participate in contribution plan | N 1,000    
Percent of participants contributions matched by company, below one percent of participants compensation 100.00%    
Percent of participants contributions matched by company, above one percent of participants compensation 50.00%    
Threshold percentage of participants compensation at which matching decreases 1.00%    
Matching contributions, percent 6.00%    
Matching contributions $ 0.6 0.5 $ 0.5
Discretionary contributions, percent 5.00%    
Discretionary contributions $ 0.4 0.3 0.3
Escrow account maintained for 2008 restricted stock plan | shares 0.1    
Maximum number of shares authorized for grant | shares 0.3    
Number of shares authorized for grant, unissued | shares 0.1    
Fair value of vested restricted shares $ 0.3 $ 0.5 $ 0.5
Pension Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Allocation of plan assets 100.00% 100.00%  
Benfit plan, Cash contributions $ 3.3    
Expected cash contributions next fiscal year $ 3.3    
Other Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Allocation of plan assets 100.00% 100.00%  
Benfit plan, Cash contributions $ 1.7    
Expected cash contributions next fiscal year $ 1.5    
Equity Securities [Member] | Pension Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Allocation of plan assets 59.10% 60.70%  
Equity Securities [Member] | Other Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Allocation of plan assets 50.00% 49.50%  
Equity Securities [Member] | Middlesex [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Allocation of plan assets 2.00% 1.80%  
Common stock in plan, value $ 1.0 $ 0.9