Pension and Other Postretirement Benefit Plans Components of Net Periodic Pension Costs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan, Service Cost	$ 1,582	$ 1,127
Defined Benefit Plan, Interest Cost	1,676	1,684
Defined Benefit Plan, Expected Return on Plan Assets	(1,291)	(1,214)
Defined Benefit Plan, Amortization of Transition Obligations (Assets)	(87)	(87)	(87)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	159	159	159
Defined Benefit Plan, Amortization of Gains (Losses)	468	0	326
Defined Benefit Plan, Net Periodic Benefit Cost	$ 2,507	$ 1,669