Employee Benefit Plans (Defined Benefit Plans Disclosure) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,195	$ 2,000	$ 6,185	$ 6,012
Interest cost	1,367	1,017	3,662	3,055
Expected return on plan assets	(1,118)	(933)	(3,353)	(2,800)
Amortization of prior service cost	214	152	432	459
Amortization of prior actuarial loss	489	808	1,407	2,427
Total	3,147	3,044	8,333	9,153
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	826	590	1,766	1,411
Interest cost	794	392	1,471	1,015
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Amortization of prior actuarial loss	361	279	795	651
Total	$ 1,981	$ 1,261	$ 4,032	$ 3,077