Accrued Expenses (Schedule Of Accrued Expenses) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accrued Expenses [Abstract]
Accrued earnouts	$ 5,534	$ 3,263
Salaries and benefits	5,432	5,087
Real estate and property taxes	5,557	6,001
Other	7,223	7,078
Total accrued expenses	$ 23,746	$ 21,429