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Benefit Plans (Details Textual)
$ in Thousands
1 Months Ended 12 Months Ended
May. 05, 2015
USD ($)
plan_participant
May. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
Number of plan participants | plan_participant 4        
Total benefit obligation $ 19,600   $ 19,571 $ 16,473 $ 13,890
Current period charge $ 5,300   5,300    
Number of plan participants who have not reached age 65 | plan_participant 2        
Accumulated Other Comprehensive Income (Loss) [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Current period charge $ 2,500   $ 2,500    
Scenario, Forecast [Member] | Chief Executive Officer [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Lump sum obligation at termination of plan   $ 14,400