Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Components of net periodic pension expense:
Interest cost	$ 572	$ 572	$ 1,714	$ 1,715
Expected return on plan assets	(698)	(800)	(2,092)	(2,399)
Amortization of net loss	385	357	1,153	1,071
Total net periodic pension expense	$ 259	$ 129	$ 775	$ 387