Fair Value Measurements (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Fair Value Measurements [Abstract]
Non-cash gain on change in fair value of contingent obligation included in general and administrative expense	$ 369,000		$ 589,000
Potential payout consideration	$ 1,500,000