Benefit Plans Schedule of Net Benefit Costs Details (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 Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 182	$ 585	$ 364	$ 1,170
Defined Benefit Plan, Interest Cost	3,584	2,632	7,168	5,264
Defined Benefit Plan, Expected Return on Plan Assets	(4,009)	(2,960)	(8,017)	(5,920)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	698	117	1,331	234
Defined Benefit Plan, Amortization of Gains (Losses)	804	1,174	1,513	2,348
Defined Benefit Plan, Net Periodic Benefit Cost	1,259	1,548	2,359	3,096
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	16	25	33	50
Defined Benefit Plan, Interest Cost	164	130	327	260
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(117)	(117)	(234)	(234)
Defined Benefit Plan, Amortization of Gains (Losses)	59	67	118	134
Defined Benefit Plan, Net Periodic Benefit Cost	$ 122	$ 105	$ 244	$ 210