Income Taxes Income Tax Disclosure (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits	$ 3,011,000	$ 2,878,000	$ 1,358,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 2,600,000