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Employee Benefit Plans (Details) - Supplemental Executive Retirement Plan (SERP) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Supplemental Executive Retirement Plan Disclosure    
Increase (reduction) to benefit obligation $ 7.1  
Discount Rate (as a percent) 3.36% 3.82%