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Additional Paid-In Capital (Summary Of Restricted Stock Units Activity) (Details) (USD $)
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Additional Paid-In Capital [Abstract]    
Unvested, Number of units (in shares) 1,577,716 1,994,507
Cancelled, Number of units (in shares) 351,340  
Vested, Number of units (in shares) 116,875  
Granted, Number of units (in shares) 51,424  
Unvested, Weighted average fair value (in dollars per share) $ 3.43 $ 3.52
Vested, Weighted average fair value (in dollars per share) $ 3.51  
Cancelled, Weighted average fair value (in dollars per share) $ 3.58  
Granted, Weighted average fair value (in dollars per share) $ 1.68