Employee Benefit Plans Effect of Change in Discount Rate and Expected Return on Plan Assets Table (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Pension Plans, Defined Benefit [Member]
Effect of Twenty-Five Basis Point Change in Discount Rate
Effect of Twenty-Five Basis Point Increase in Discount Rate on Benefit Obligation	$ (1,380)
Effect of Twenty-Five Basis Point Decrease in Discount Rate on Benefit Obligation	1,450
Effect of Twenty-Five Basis Point Increase in Discount Rate on Expense	(110)
Effect of Twenty-Five Basis Point Decrease in Discount Rate on Expense	110
Effect of Fifty Basis Point Change in Expected Return on Plan Assets
Effect of Fifty Basis Point Increase in Expected Return on Plan Assets on Expense	(150)
Effect of Fifty Basis Point Decrease in Expected Return on Plan Assets on Expense	150
Other Postretirement Benefit Plans, Defined Benefit [Member]
Effect of Twenty-Five Basis Point Change in Discount Rate
Effect of Twenty-Five Basis Point Increase in Discount Rate on Benefit Obligation	(20)
Effect of Twenty-Five Basis Point Decrease in Discount Rate on Benefit Obligation	20
Effect of Twenty-Five Basis Point Increase in Discount Rate on Expense	0
Effect of Twenty-Five Basis Point Decrease in Discount Rate on Expense	$ 0