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Employee Benefit Plans (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
DB Pension Plan      
Net actuarial loss (gain) $ 39,601 $ 38,695 $ 40,437
Prior service cost (credit) (40) (55) (6,506)
Total 39,561 38,640 33,931
Life and Healthcare Plan      
Net actuarial loss (gain) 1,093 889 1,375
Prior service cost (credit) 235 250 266
Total 1,328 1,139 1,641
SERPs      
Net actuarial loss (gain) 7,077 6,739 8,575
Prior service cost (credit) 689 576 648
Total $ 7,766 $ 7,315 $ 9,223