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Retirement Plans, Accumulated Benefit Obligation in Excess of Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation at end of year $ 0 $ 0
Accumulated benefit obligation at end of year 0 0
Fair value of plan assets at end of year 0 0
SERP [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation at end of year 1,526 1,637
Accumulated benefit obligation at end of year 1,526 1,637
Fair value of plan assets at end of year $ 0 $ 0