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Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Dec. 31, 2015
Defined benefit pension plan      
Defined Benefit Plan Disclosure [Line Items]      
Benefits paid $ 1,000    
Other postretirement benefits      
Defined Benefit Plan Disclosure [Line Items]      
Benefits paid   $ 62  
Company contribution to employee benefit plans     $ 400