Income Taxes (Components Of Income Before Income Tax Expense And A Reconciliation Of The Statutory Federal Income Tax Rate To The Income Tax Rate) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
U.S.	$ 89,188	$ 70,657	$ 59,853
International	(841)	1,115	1,279
Income before income tax expense	88,347	71,772	61,132
Current, U.S.	32,871	18,706	18,464
Current, State, local and foreign	3,892	2,441	2,198
Current, Total	36,763	21,147	20,662
Deferred, U.S.	(3,783)	3,700	1,310
Deferred, State, local and foreign	2,076	2,447	(3,000)
Deferred, Total	(1,707)	6,147	(1,690)
Income tax expense (benefit)	35,056	27,294	18,972
U.S. statutory rate	35.00%	35.00%	35.00%
Income tax expense at U.S. statutory rate	30,921	25,120	21,396
State income taxes, net of federal benefit	3,452	2,834	2,904
Meals and entertainment	198	187	199
Change in valuation allowance for foreign tax credit and capital loss	1,099	(169)
State NOL's recognized			(4,801)
Adjustments to tax liabilities	(279)	202	207
Other	$ (335)	$ (880)	$ (933)
Effective tax rate	39.70%	38.00%	31.00%