Stock-Based Compensation (Summary of Stock Option Activity) (Details) (Stock Option [Member], USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Outstanding and Exercisable, Beginning of Period	39,950	80,950	180,950
Shares, Granted	0	0	0
Shares, Canceled	0	0	0
Shares, Exercised	(17,450)	(41,000)	(100,000)
Shares, Outstanding and Exercisable, End of Period	22,500	39,950	80,950
Number of shares available for grant - Beginning,	315,840	391,881	443,566
Number of shares available for grant - Ending,	561,655	315,840	391,881
Weighted Average Exercise Price, Exercised	$ 7.03	$ 5.02	$ 4.51
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	2 years 2 months 12 days	2 years 9 months 18 days	2 years 8 months 12 days
Aggregate Intrinsic Value, Outstanding and Exercisable at End of Period	$ 743	$ 773	$ 2,751