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Pension, Savings, And Other Employee Benefits (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]        
Estimated social security benefits age   65 years    
Contributions to qualified plans $ 165,000 $ 0    
Savings Plan        
Defined Benefit Plan Disclosure [Line Items]        
Employer investment in qualified defined contribution plan   100.00% 100.00%  
Maximum percent of employee pre-tax contributions that may be matched by the Company   6.00% 6.00%  
Non-Qualified Plans | Pension and Postretirement Plans        
Defined Benefit Plan Disclosure [Line Items]        
Contributions to qualified plans       $ 5,100
Expected pension contribution   $ 5,000