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Retirement Plans - Expected Annual Benefit Payments (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Pension plan  
Expected annual benefit payments based on actuarial estimates:  
2016 $ 94
2017 185
2018 232
2019 249
2020 259
Thereafter 1,833
SERP  
Expected annual benefit payments based on actuarial estimates:  
2016 437
2017 502
2018 498
2019 493
2020 487
Thereafter $ 2,469