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Employee Benefit Plans Defined Benefit Plan - Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Allocation Percentage 1    
Defined Benefit Plan, Fair Value of Plan Assets $ 41,102 $ 40,990 $ 45,187
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance 330 1,986  
Return on plan assets 23 89  
Purchases, sales and settlements, net (4,231) (3,486)  
Transfers, net 5,140 1,741  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 1,262 330  
Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 39,840 40,660  
Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 1,262 330  
Equity Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Allocation Percentage 0.6    
Defined Benefit Plan, Fair Value of Plan Assets $ 28,103 27,814  
Equity Funds [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 28,103 27,814  
Equity Funds [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 0 0  
Fixed Income Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Allocation Percentage 0.3    
Defined Benefit Plan, Fair Value of Plan Assets $ 11,737 12,846  
Fixed Income Funds [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 11,737 12,846  
Fixed Income Funds [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 0 0  
Other Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Allocation Percentage 0.1    
Defined Benefit Plan, Fair Value of Plan Assets $ 1,262 330  
Other Investments [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Other Investments [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 1,262 $ 330