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Benefit Plans Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 119,261 $ 109,415  
Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Actual plan asset allocations as a percent of toal plan assets 58.00%    
Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 10,050 9,500  
Actual plan asset allocations as a percent of toal plan assets 8.00%    
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 113,895 104,953 $ 99,628
Pension Plan [Member] | Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 38,887 $ 37,088  
Actual plan asset allocations as a percent of toal plan assets 34.00% 35.00%  
Pension Plan [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 66,022 $ 58,958  
Actual plan asset allocations as a percent of toal plan assets 58.00% 56.00%  
Pension Plan [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 8,986 $ 8,907  
Actual plan asset allocations as a percent of toal plan assets 8.00% 8.00%  
Other Postretirement Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 5,366 $ 4,462 $ 4,251
Other Postretirement Benefit Plan [Member] | Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 1,627 $ 1,527  
Actual plan asset allocations as a percent of toal plan assets 30.00% 34.00%  
Other Postretirement Benefit Plan [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 2,675 $ 2,343  
Actual plan asset allocations as a percent of toal plan assets 50.00% 53.00%  
Other Postretirement Benefit Plan [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 1,064 $ 592  
Actual plan asset allocations as a percent of toal plan assets 20.00% 13.00%