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Pension and Retirement Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Actual allocations 100.00% 100.00%  
Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Actual allocations 66.00% 65.60%  
Target Plan Asset Allocations, Minimum 53.00% 53.00%  
Target Plan Asset Allocations, Maximum 73.00% 73.00%  
Debt Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Actual allocations 30.70% 30.10%  
Target Plan Asset Allocations, Minimum 21.00% 21.00%  
Target Plan Asset Allocations, Maximum 41.00% 41.00%  
Money Market Funds [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Actual allocations 3.30% 4.30%  
Target Plan Asset Allocations, Minimum 0.00% 0.00%  
Target Plan Asset Allocations, Maximum 15.00% 15.00%  
Pension Benefits [Member]      
Change in benefit obligation [Roll forward]      
Benefit obligation, beginning of year $ 15,986 $ 13,815  
Interest cost 596 620 $ 561
Actuarial (gain)/loss (417) 2,118  
Benefits paid (600) (567)  
Benefit obligation, end of year 15,565 15,986 13,815
Accumulated benefit obligation 15,565 15,986  
Change in plan assets [Roll forward]      
Fair value of plan assets, beginning of year 13,283 12,693  
Actual gain/(loss) on plan assets (279) 819  
Employer contribution 284 338  
Benefits paid (600) (567)  
Fair value of plan assets, end of year 12,688 13,283 12,693
Funded status, end of year (2,877) (2,703)  
Amounts recognized in the consolidated balance sheets [Abstract]      
Noncurrent liabilities (2,877) (2,703)  
Net amount recognized (2,877) (2,703)  
Amounts recognized in accumulated other comprehensive income consist of [Abstract]      
Net loss 6,098 5,896  
Net amount recognized $ 6,098 $ 5,896  
Weighted average assumptions used to determine benefit obligations as of December 31 [Abstract]      
Discount rate 4.28% 3.81%  
Expected return on plan assets 7.00% 7.00%  
Rate of compensation increase  
Components of net periodic benefit cost [Abstract]      
Interest cost $ 596 $ 620 561
Expected return on plan assets (840) (816) (693)
Amortization of actuarial loss 500 295 536
Net periodic benefit cost 256 99 404
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract]      
Net actuarial (gain)/loss for the year 702 2,115 (2,109)
Amortization of net loss (500) (295) (536)
Total recognized in other comprehensive income 202 1,820 (2,645)
Total recognized in net periodic benefit cost and other comprehensive income $ 458 $ 1,919 $ (2,241)
Weighted average assumptions used to determine net periodic benefit cost for years ended December 31 [Abstract]      
Discount rate 3.81% 4.60% 3.82%
Expected return on plan assets 7.00% 7.00% 7.00%
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]      
Company's expectation to contribute to the plans during the next year $ 0    
Future amortization of a net loss in pension benefits in next year (480)    
Estimated future benefit payments [Abstract]      
2016 730    
2017 730    
2018 790    
2019 840    
2020 870    
2021 - 2025 $ 4,670