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Employee Retirement Plans (Details)	12 Months Ended
Employee Retirement Plans (Details)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Assumptions used to determine benefit obligations at the annual measurement date were:
Obligation discount rate	5.40%	5.90%	6.10%
Compensation increase rate	3.00%	3.00%	3.00%
Assumptions used to determine net periodic benefit costs were:
Obligation discount rate	5.90%	6.10%	6.50%
Long-term rate of return on plan assets	7.75%	7.75%	7.75%
Compensation increase rate	3.00%	3.00%	4.00%

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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