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Retirement Plans (Benefit Payments) (Details) - Retirement Income Plan [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Estimated contribution from the employer $ 11,700
2016 9,917
2017 10,958
2018 12,005
2019 13,045
2020 14,092
2021 - 2025 $ 84,400