Employee Benefit Plans (Defined Benefit Plans Disclosure) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,000	$ 1,910	$ 6,012	$ 5,638
Interest cost	1,017	1,065	3,055	3,135
Expected return on plan assets	(933)	(766)	(2,800)	(2,299)
Amortization of prior service cost	152	102	459	288
Amortization of prior actuarial loss	808	851	2,427	2,514
Total	3,044	3,162	9,153	9,276
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	590	673	1,411	1,231
Interest cost	392	418	1,015	935
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Amortization of prior actuarial loss	279	380	651	557
Total	$ 1,261	$ 1,471	$ 3,077	$ 2,723