Fair Value Measurements (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Fair Value Measurements (Textual) [Abstract]
Unrealized losses on sale of securities		$ 700,000
Fair Value Measurements, Inter-transfers between Levels	0	0
Maximum [Member]
Fair Value Measurements (Textual) [Abstract]
Business Combination Contingent Consideration Liability Extended Term	6 years
Minimum [Member]
Fair Value Measurements (Textual) [Abstract]
Business Combination Contingent Consideration Liability Extended Term	3 years
Auction Rate Securities [Member]
Fair Value Measurements (Textual) [Abstract]
Gain on Sale of Investment		$ 100,000