Income Taxes Gross Unrecognized Tax Benefit (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 2,127,000	$ 85,000
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	0
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	772,000
Unrecognized Tax Benefits, Increases Resulting from Acquisition	1,270,000
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	$ 0