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Employee Benefit Plans - Pension Plan Asset Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Asset Category      
Fair Value of Plan Assets (in dollars) $ 66,159 [1] $ 65,189 $ 64,903
Percentage of Plan Assets 100.00% 100.00%  
Equity securities      
Asset Category      
Fair Value of Plan Assets (in dollars) [1] $ 39,954    
Percentage of Plan Assets 60.00% 60.00%  
Fixed income      
Asset Category      
Fair Value of Plan Assets (in dollars) [1] $ 22,734    
Percentage of Plan Assets 35.00% 33.00%  
Cash equivalents      
Asset Category      
Fair Value of Plan Assets (in dollars) [1] $ 3,471    
Percentage of Plan Assets 5.00% 7.00%  
Minimum | Equity securities      
Asset Category      
Target plan asset allocations 50.00%    
Minimum | Fixed income      
Asset Category      
Target plan asset allocations 30.00%    
Minimum | Cash equivalents      
Asset Category      
Target plan asset allocations 2.00%    
Maximum | Equity securities      
Asset Category      
Target plan asset allocations 60.00%    
Maximum | Fixed income      
Asset Category      
Target plan asset allocations 48.00%    
Maximum | Cash equivalents      
Asset Category      
Target plan asset allocations 10.00%    
[1] Additional information regarding the fair value of Pension Plan assets as of December 31, 2017 can be found in Note 21, "Fair Value."