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Employee Benefit Plans - Summary of pre tax amounts recognized in comprehensive loss (Details 3) - Retirement Income Plan - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Net loss (gain) $ (1,621) $ 10,745 $ (6,976)
Amortization of net loss $ (790) $ (531) $ (784)
Net transition obligation (asset)
Amount recognized in accumulated other comprehensive loss $ (2,411) $ 10,214 $ (7,760)