Employee Benefit Plans Amounts Recognized in Consolidated Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Employee Benefit Plans [Abstract]
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	$ 0	$ 0
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	2,095	953
Pension and Other Postretirement Defined Benefit Plans, Liabilities	2,095	953
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	1,985	950
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax	$ 1,985	$ 950