Employee Benefit Plans (Net Periodic Pension Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 277	$ 281	$ 219
Interest cost	3,429	3,519	3,585
Return on plan assets	(4,566)	(4,378)	(4,227)
Amortization of loss	2,876	1,578	1,313
Net periodic pension cost	$ 2,016	$ 1,000	$ 890