Employee Benefit Plans (Defined Benefit Plans Disclosure) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,489	$ 2,129	$ 3,990	$ 4,012
Interest cost	1,487	1,020	2,295	2,038
Expected return on plan assets	(1,302)	(1,100)	(2,235)	(1,867)
Amortization of prior service cost	216	213	218	307
Amortization of prior actuarial loss	245	782	918	1,619
Total	3,135	3,044	5,186	6,109
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	470	410	940	820
Interest cost	339	311	677	623
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Amortization of prior actuarial loss	217	186	434	372
Total	$ 1,026	$ 907	$ 2,051	$ 1,815