Employee Benefit Plans (Schedule of Projected Benefit Obligation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Projected benefit obligation:
Balance, January 1	$ 67,087	$ 53,972
Service cost	3,452	2,799
Interest cost	2,819	2,570
Actuarial loss	(8,496)	9,063
Benefits paid	(1,423)	(1,317)
Balance, December 31	63,439	67,087
Plan assets:
Fair value, January 1	61,384	53,895
Actual return	9,166	6,556
Employer contribution	1,500	2,250
Benefits paid	(1,423)	(1,317)
Fair value, December 31	70,627	61,384
Funded status:
Accrued pension asset (liability)	$ 7,188	$ (5,703)