Stockholders' Equity (Schedule Of Restricted Stock Activity) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Summary Of Significant Accounting Policies [Abstract]
Beginning of period, Non-vested shares	542,517	414,399
Beginning of period, Weighted average grant date fair value	$ 15.24	$ 17.86
Granted, Non-vested shares	46,500	117,100
Granted, Weighted average grant date fair value	$ 17.15	$ 13.50
Vested, Non-vested shares	(26,494)	(64,625)
Vested, Weighted average grant date fair value	$ 16.46	$ 16.52
End of period, Non-vested shares	562,523	466,874
End of period, Weighted average grant date fair value	$ 15.34	$ 16.94