Employee Benefit Plans (Schedule of Plan's Pension Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	$ 3,559	$ 3,795
Interest cost on projected benefit obligations	3,505	3,178
Defined Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	3,559	3,796	$ 3,003
Interest cost on projected benefit obligations	3,505	3,178	3,037
Expected return on plan assets	(4,734)	(4,864)	(4,711)
Net amortization and deferral	1,259	1,542	244
Net periodic pension cost	$ 3,589	$ 3,652	$ 1,573