Savings And Profit Sharing Plans (Narrative) (Details)	12 Months Ended
	Dec. 31, 2011
Savings and Profit Sharing Plans [Line Items]
Qualified employees participation contribution, percentage of gross earnings	15.00%
Effective From March 1, 2009 [Member]
Savings and Profit Sharing Plans [Line Items]
Percentage of matching contribution from gross eligible earnings by employer	6.00%
Reduction in percentage of matching contribution from gross eligible earnings by employer	3.00%
Matching contribution rate by the employer	50.00%
Effective From January 1, 2010 [Member]
Savings and Profit Sharing Plans [Line Items]
Percentage of matching contribution from gross eligible earnings by employer	4.00%
100% Matching Contribution [Member]
Savings and Profit Sharing Plans [Line Items]
Matching contribution rate by the employer	100.00%
Percentage of gross eligible earnings for matching contribution	2.00%
50% Matching Contribution [Member]
Savings and Profit Sharing Plans [Line Items]
Matching contribution rate by the employer	50.00%
Percentage of gross eligible earnings for matching contribution	4.00%