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Retirement and Other Employee Benefits (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Defined Contribution Plan Disclosure [Line Items]            
Gain on pension plan curtailment $ 0 $ 29,578,000 $ 0 $ 29,578,000 $ 0  
Qualified pension benefits plan under-funded amount $ 33,353,000     $ 33,353,000   $ (51,973,000)
Funded status percentage 104.00%     104.00%   94.00%
Cash contribution to qualified pension benefits plan       $ 0    
Cash expected contribution to plan over remainder of fiscal year (up to)       $ 0    
One-Time Contribution            
Defined Contribution Plan Disclosure [Line Items]            
One-time matching contribution percentage 3.00%          
One-time contribution amount $ 11,540,000