Employee Benefits Plans (Details) - Amount recognized in accumulated other comprehensive (loss) income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Deferred Compensation Plan [Member]
Employee Benefits Plans (Details) - Amount recognized in accumulated other comprehensive (loss) income [Line Items]
Net loss (gain)	$ 1,752	$ 1,614
Supplemental Employee Retirement Plan [Member]
Employee Benefits Plans (Details) - Amount recognized in accumulated other comprehensive (loss) income [Line Items]
Net loss (gain)	686	704
Net loss (gain)	33
Other Postretirement Benefit Plan [Member]
Employee Benefits Plans (Details) - Amount recognized in accumulated other comprehensive (loss) income [Line Items]
Net loss (gain)	(182)	$ (149)
Net loss (gain)	$ (16)