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Qualified Employee Benefit Plans - Future Benefit Payments to be Paid (Details) - Retirement Plan [Member]
$ in Thousands
Dec. 31, 2015
USD ($)
Expected future benefit payments [Abstract]  
2016 $ 5,599
2017 4,400
2018 5,195
2019 5,920
2020 4,889
2021-2025 $ 35,655