Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Components of net periodic pension expense:
Interest cost	$ 572	$ 590	$ 1,715	$ 1,770
Expected return on plan assets	(800)	(776)	(2,399)	(2,328)
Amortization of net loss	357	80	1,071	240
Total net periodic pension expense (income)	$ 129	$ (106)	$ 387	$ (318)