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Employee Benefit Plans (Details 5) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Fair Value $ 19,924 $ 16,502 $ 15,031
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 18,143 14,126  
Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 1,781 2,376  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 0  
Cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 1,307 1,362  
Cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 1,307 1,362  
Cash equivalents | Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 0  
Cash equivalents | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 0  
Mutual Fund      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 16,836 12,764  
Mutual Fund | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 16,836 12,764  
Mutual Fund | Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 0  
Mutual Fund | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 0  
U.S. gov't agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 1,781 2,376  
U.S. gov't agency obligations | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0 0  
U.S. gov't agency obligations | Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 1,781 2,376  
U.S. gov't agency obligations | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value $ 0 $ 0