Contingent Consideration (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Contingent Consideration [Abstract]
Contingent consideration accrued, current	$ 1,300,000		$ 1,600,000
Contingent consideration accrued, noncurrent	363,000		902,000
Payments of the liability-classified contingent consideration arrangements	$ 979,000	$ 0