Commitments and Contingencies Line of Credit (Details) (USD $)	3 Months Ended
	Mar. 31, 2013
Commitments and Contingencies [Abstract]
Line of Credit Maintained	$ 5,000,000
Line of Credit Facility, Expiration Date	Jul. 01, 2013
Number of Letter of Credit	1
Letters of Credit Outstanding, Amount	$ 113,000