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Employee Benefit Plans (Details 5) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Fair Value $ 16,502 $ 15,031 $ 14,933
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 14,126 13,229  
Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 2,376 1,802  
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 1,362 1,663  
Cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 1,362 1,663  
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 12,764 11,566  
Mutual Fund | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 12,764 11,566  
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 2,376 1,802  
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 2,376 1,802  
U.S. gov't agency obligations | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value $ 0 $ 0