Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	$ 1,885	$ 1,588
Defined contribution plan, contribution amount	$ 658	623	$ 584
Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Target plan asset	48.00%
U.S. Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Target plan asset	36.00%
Non-U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target plan asset	16.00%
Defined Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 74,425	68,321
Recognized prior service (cost) benefit	0
Net gains (losses) as a component of net periodic benefit cost	1,328
Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	7,904	7,482
Contributions for plan	$ 5,367	5,211	5,298
Expected future benefits payable period	10 years
Benefits paid	$ 247	$ 243	$ 236
Recognized prior service (cost) benefit	0
Net gains (losses) as a component of net periodic benefit cost	$ 323