Employee Benefit Plans (Reconciliation of the Projected Benefit Obligation) (Details) - Other postretirement benefits - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in benefit obligation:
Benefit obligation at beginning of year	$ 6,767	$ 6,376
Service cost — benefits earned during the year	147	130	$ 154
Interest cost	251	269	255
Actuarial (gain) loss	(812)	462
Plan participants' contributions	628	708
Benefits paid	(881)	(1,178)
Benefit obligation and funded status at end of year	$ 6,100	$ 6,767	$ 6,376