Employee Benefit Plans (Details 3) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost
Prior service cost	$ (355)
Net actuarial loss	914
Pension Benefits
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost
Prior service cost	0
Net actuarial loss	146
Postretirement Benefits
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost
Prior service cost	(355)
Net actuarial loss	$ 768