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Retirement and Other Employee Benefits (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jan. 01, 2016
pension_plan
Pension plan        
Retirement and Other Employee Benefits        
Obligation for defined benefit plans $ 0      
Pension costs under the defined benefit plan 0 $ 72,000 $ 339,000  
Postretirement benefits        
Retirement and Other Employee Benefits        
Pension costs under the defined benefit plan 0 3,000 13,000  
Subsequent Event | Pension plan        
Retirement and Other Employee Benefits        
Number of pension plans | pension_plan       2
Pension plan        
Retirement and Other Employee Benefits        
Amount expensed under the defined contribution plan $ 9,000 $ 16,000 $ 41,000