Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Projected Benefit Obligation and Accumulated Benefit Obligation in Excess of Plan Assets (Details)

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Employee Benefit Plans - Projected Benefit Obligation and Accumulated Benefit Obligation in Excess of Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Plan assets in excess of projected benefit obligation:      
Projected benefit obligation $ 4,745 $ 5,032  
Fair value of plan assets 5,313 5,356 $ 4,937
Plan assets in excess of accumulated benefit obligation:      
Accumulated benefit obligation 4,173 4,510  
Fair value of plan assets $ 5,313 $ 5,356