Pension and Other Post-Retirement Benefits Expected Future Benefit Payments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
Expected Future Benefit Payments [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	$ 354
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	382
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	414
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	44
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	505
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	3,363
Pension Plans, Defined Benefit [Member]
Expected Future Benefit Payments [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	2,701
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	2,880
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	3,383
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	3,723
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	3,831
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	$ 25,124