Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Contingency [Line Items]
Number of years under state audit	four years
Income Taxes (Textual) [Abstract]
Federal net operating loss carry forwards	$ 73.0
Effective income tax rate	41.20%	44.30%	41.50%
Tax expense included in provision for 2010 income taxes, net of tax			$ 3.5
Percentage of cumulative ownership	50.00%
Cumulative ownership change period	three-year period