Pension and Postretirement Benefits other than Pensions Pension Amounts Recognized in Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Pension Plan, Liabilities, Noncurrent	$ 88,779	$ 79,717
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	3,737	2,847
Defined Benefit Pension Plan Liabilities, Current	106	54
Defined Benefit Pension Plan, Liabilities, Noncurrent	88,779	79,717
Defined Benefit Plan, Amounts Recognized in Balance Sheet	$ (85,148)	$ (76,924)