Benefit Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate of participants in plans	17
Stock Options [Member]
Summary of stock options' status, in shares [Roll Forward]
Options outstanding, beginning of year (in shares)	231,000	543,500
Options exercised (in shares)	(150,000)	(177,500)
Options canceled or expired (in shares)	(4,000)	(135,000)
Options outstanding, end of year (in shares)	77,000	231,000
Options exercisable (in shares)	77,000	231,000
Options available for future grant (in shares)	2,000,000	2,666,406
Weighted Average Exercise Price [Roll Forward]
Options outstanding, beginning of year (in dollars per share)	$ 1.68	$ 1.44
Options exercised (in dollars per share)	$ 1.73	$ 1.25
Options canceled or expired (in dollars per share)	$ 1.59	$ 1.26
Options outstanding, end of year (in dollars per share)	$ 1.59	$ 1.68
Options exercisable (in dollars per share)	$ 1.59	$ 1.68
Plan 2012 [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance (in shares)	2,000,000