Share-Based Compensation (Narrative) (Details) (USD $)	3 Months Ended				3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 2012 Plan [Member]	May 31, 2012 2012 Plan [Member]	Mar. 31, 2013 1997 Plan [Member]	Mar. 31, 2013 2005 Plan [Member]	May 31, 2005 2005 Plan [Member]	Mar. 31, 2013 Expected to be recognized during 2013 [Member]	Mar. 31, 2013 Expected to be recognized during 2014 [Member]	Mar. 31, 2013 Expected To Be Recognized During 2015 [Member]
Common stock on date granted term period, years			5		5	10
Shares available for grants			1,140,000	1,500,000	0	20,635	1,500,000
Combined share-based compensation expense for 2005 Plan and 1997 Plan	$ 1,580,000	$ 1,432,000
Expenses, stock options		1,431,000
Expenses, restricted stock		1,000
Unrecognized compensation cost	$ 1,176,000							$ 760,000	$ 375,000	$ 41,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			5 years			10 years