XML 124 R108.htm IDEA: XBRL DOCUMENT v3.3.1.900
Employee Benefit Plans (Summary Of Current Allocation Percentages Of Plan Assets) (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Horizon Defined Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 100.00%  
Percentage of Plan Assets 100.00% 100.00%
Horizon Defined Benefit Plan | Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 63.00%  
Allowable-Allocation Range, Minimum 40.00%  
Allowable-Allocation Range, Maximum 90.00%  
Percentage of Plan Assets 51.00% 53.00%
Horizon Defined Benefit Plan | Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 15.00%  
Allowable-Allocation Range, Minimum 10.00%  
Allowable-Allocation Range, Maximum 40.00%  
Percentage of Plan Assets 20.00% 23.00%
Horizon Defined Benefit Plan | Cash and Cash Equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 2.00%  
Allowable-Allocation Range, Minimum 3.00%  
Allowable-Allocation Range, Maximum 10.00%  
Percentage of Plan Assets 10.00% 9.00%
Horizon Defined Benefit Plan | Other Securities    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 20.00%  
Allowable-Allocation Range, Minimum 0.00%  
Allowable-Allocation Range, Maximum 25.00%  
Percentage of Plan Assets 19.00% 15.00%
Community Defined Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 100.00%  
Percentage of Plan Assets 100.00% 100.00%
Community Defined Benefit Plan | Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 25.00%  
Allowable-Allocation Range, Minimum 20.00%  
Allowable-Allocation Range, Maximum 30.00%  
Percentage of Plan Assets 25.00% 25.00%
Community Defined Benefit Plan | Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 75.00%  
Allowable-Allocation Range, Minimum 70.00%  
Allowable-Allocation Range, Maximum 80.00%  
Percentage of Plan Assets 75.00% 75.00%