Employee Benefit Plans (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Pension Plans, Defined Benefit
Components of net periodic benefit costs:
Interest cost	$ 109,000	$ 109,000	$ 219,000	$ 224,000
Expected return on plan assets	(146,000)	(121,000)	(246,000)	(251,000)
Amortization of net loss	48,000	31,000	48,000	64,000
Settlement of benefit obligation	0	(103,000)	0	(372,000)
Net periodic benefit/cost	11,000	122,000	21,000	409,000
Other Postretirement Benefit Plans, Defined Benefit
Components of net periodic benefit costs:
Interest cost	1,000	1,000	2,000	2,000
Amortization of net loss	(2,000)	(1,000)	(3,000)	(2,000)
Net periodic benefit/cost	$ (1,000)	$ 0	$ (1,000)	$ 0
Other Postretirement Benefit Plans, Defined Benefit | Employees Hired before January 1, 2003
Components of net periodic benefit costs:
Benefit based on highest average salary for number of consecutive years			5 years
Number of years for consecutive years calculation			10 years
Other Postretirement Benefit Plans, Defined Benefit | Employees Hired on or after January 1, 2003
Components of net periodic benefit costs:
Percent of annual salary to calculate benefit			2.00%