Employee Benefit Plans (Defined Benefit Plans Disclosure) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,501	$ 1,883
Interest cost	808	1,018
Expected return on plan assets	(933)	(767)
Amortization of prior service cost	2	94
Amortization of prior actuarial loss	673	837
Total	2,051	3,065
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	470	410
Interest cost	338	312
Expected return on plan assets	0	0
Amortization of prior service cost	0	0
Amortization of prior actuarial loss	217	186
Total	$ 1,025	$ 908