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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Service Cost $ 587 $ 468  
Defined Benefit Plan, Interest Cost 985 670  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (780) (717)  
Defined Benefit Plan, Amortization of Gain (Loss) 253 0  
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position 110,000   $ 110,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 1,045 $ 421