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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation      
Income tax computed at statutory federal rate 35.00% 35.00% 35.00%
State income taxes, net of federal benefit 3.00% 3.00% 4.00%
Deferred state rate impact (1.00%) 0.00% (1.00%)
Research and development credits (3.00%) 0.00% 0.00%
Net impact to uncertain income tax positions 0.00% 1.00% 0.00%
Other 0.00% (1.00%) 2.00%
Effective income tax rate 34.00% 38.00% 40.00%