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Components of Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Components Of Net Periodic Pension Cost Details        
Interest cost $ 129 $ 129 $ 257 $ 267
Expected return on plan assets (155) (127) (291) (264)
Net amortization 102 108 204 216
Recognized settlement loss 115 565
Net periodic pension cost 76 225 170 784
Amortization of actuarial loss (261) (101) (1,003)
Total recognized in other comprehensive income (261) (101) (1,003)
Total recognized in net expense and OCI (before tax) 76 $ (36) $ 69 $ (219)
Defined Benefit Plan, Contributions by Employer $ 2,000