Employee Benefit Plans Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net gains (losses)	$ 60,171	$ (17,630)	$ (75,995)
Prior service cost	0	0	0
Negative plan amendment	0	0	0
Amortization of losses	20,914	17,578	10,372
Amortization of prior service cost	1,356	1,308	1,359
Amortization of negative plan amendment	0	0	0
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net gains (losses)	3,206	(2,021)	(3,934)
Prior service cost	0	0	631
Negative plan amendment	3,372	0	0
Amortization of losses	675	582	570
Amortization of prior service cost	66	80	69
Amortization of negative plan amendment	$ (105)	$ (55)	$ 0