Annual report pursuant to Section 13 and 15(d)

Employee Retirement Plans - FV Rollforward (Details)

v3.8.0.1
Employee Retirement Plans - FV Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of the fair value measurements using significant unobservable inputs (Level 3)    
Fair value of plan assets at beginning of year $ 29,223  
Fair value of plan assets at end of year 33,903 $ 29,223
Level 3    
Reconciliation of the fair value measurements using significant unobservable inputs (Level 3)    
Fair value of plan assets at beginning of year 1,748 1,748
Deposits 100 101
Actual return on plan assets held at reporting date 142 138
Withdrawls 36 145
Fair value of plan assets at end of year 2,026 1,748
Pension plan    
Reconciliation of the fair value measurements using significant unobservable inputs (Level 3)    
Fair value of plan assets at beginning of year 29,223 26,378
Fair value of plan assets at end of year $ 33,903 $ 29,223