Accrued Expenses (Schedule Of Accrued Expenses) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accrued Expenses [Abstract]
Accrued earnouts	$ 3,265	$ 4,128
Salaries and benefits	11,367	11,910
Real estate and property taxes	8,285	7,644
Acquisitions	39,631
Non-cash capital expenditures	6,059	6,970
Other	27,586	30,477
Total accrued expenses	$ 96,193	$ 61,129