Employee Benefit Plans (Schedule of Benefits Plans) (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 Benefit Plan [Member]
Periodic costs for employee retirement benefit plans
Service Cost	$ 473	$ 575	$ 1,420	$ 1,725
Interest Cost	670	617	2,011	1,851
Expected Return on Assets	(883)	(724)	(2,650)	(2,171)
Amortization of Unrecognized Losses	104	408	312	1,224
Amortization of Unrecognized Prior Service Cost (Credit)	1	2	2	7
Net Periodic Benefit Cost	365	878	1,095	2,636
Other Benefits Plan [Member]
Periodic costs for employee retirement benefit plans
Service Cost	258	334	774	1,003
Interest Cost	448	399	1,344	1,196
Expected Return on Assets	(484)	(406)	(1,453)	(1,217)
Amortization of Unrecognized Losses	353	516	1,060	1,549
Amortization of Unrecognized Prior Service Cost (Credit)	(432)	(432)	(1,296)	(1,296)
Net Periodic Benefit Cost	$ 143	$ 411	$ 429	$ 1,235