Retirement Plans (Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2013 Pension Benefits [Member]	Dec. 31, 2012 Pension Benefits [Member]	Dec. 31, 2011 Pension Benefits [Member]	Dec. 31, 2013 Postretirement Benefits Other Than Pensions (OPEB) [Member]	Dec. 31, 2012 Postretirement Benefits Other Than Pensions (OPEB) [Member]	Dec. 31, 2011 Postretirement Benefits Other Than Pensions (OPEB) [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost				$ 47,651	$ 43,688	$ 38,879	$ 12,533	$ 10,812	$ 8,958
Interest cost on projected benefit obligation				75,812	78,027	84,228	17,241	17,842	17,722
Expected return on plan assets				(94,695)	(95,777)	(100,558)	(136)	(172)	(324)
Amortization of prior service cost/(credit)				8	(199)	(199)	(6,101)	(10,068)	(10,198)
Amortization of unrecognized loss				36,930	29,890	15,364	7,846	7,537	4,424
Net periodic pension benefit cost				65,706	55,629	37,714	31,383	25,951	20,582
Pension settlement costs	3,900	40,300	44,163	44,163
Total periodic benefit cost				109,869	55,629	37,714
Amortization of prior service cost/(credit) expected in 2014				45			(3,560)
Amortization of unrecognized loss expected in 2014				$ 19,274			$ 2,886