Employee Benefit Plans (Schedule of Amounts Recognized in AOCL) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service (credit) cost	$ 1	$ (1,076)
Net actuarial loss	14,020	13,260
Total amount recognized in AOCL	14,021	12,184
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service (credit) cost	5,388	7,084
Net actuarial loss	32,502	23,779
Total amount recognized in AOCL	$ 37,890	$ 30,863