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Employee Benefit Plans - Defined Benefit Plan Obligations Assumptions (Details)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Increase in compensation levels     2.00%
Weighted Average [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Weighted average discount rate 4.55% 4.23% 5.08%