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Income Taxes Income tax rate reconciliation (Details)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Disclosure [Abstract]      
Computed expected income tax (benefit) expense (35.00%) (35.00%) 35.00%
Reduction (increase) in income tax benefit and increase (reduction) in income tax expense resulting from:      
State tax, net of federal benefit 0.00% 2.00% 9.00%
Change in federal valuation allowance 35.00% 33.00% (33.00%)
Other 0.00% 4.00% 3.00%
Effective income tax rate 0.00% 4.00% 14.00%