Employee Benefit Plans (Schedule of Plan's Pension Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Service cost - benefits earned during the year	$ 3,452	$ 2,799
Interest cost on projected benefit obligations	2,819	2,570
Defined Benefit Plan [Member]
Service cost - benefits earned during the year	3,452	2,799	2,073
Interest cost on projected benefit obligations	2,819	2,570	2,423
Expected return on plan assets	(4,469)	(3,967)	(3,314)
Net amortization and deferral	1,729	1,473	603
Net periodic pension cost	$ 3,531	$ 2,875	$ 1,785