Income Taxes (Statutory tax rate impact on Income tax expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	$ 7,437	$ 4,500	$ 6,215
Income Tax Reconciliation, State and Local Income Taxes	1,770	1,141	1,129
Income Tax Reconciliation, Nondeductible Expense, Meals and Entertainment	777	737	775
Income Tax Reconciliation Nondeductible Expense Lobbying	298	327	405
Income Tax Reconciliation, Nondeductible Expense, Share-based Compensation Cost	1,718	758	722
Income Tax Reconciliation, Nondeductible Expense, Other	88	(58)	2
Income Tax Expense (Benefit), Total	$ 12,088	$ 7,405	$ 9,248