Independent Contractor Operations (Schedule Of Independent Contractors) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Independent Contractor Operations [Abstract]
Revenues	$ 6,942	$ 6,575	$ 20,434	$ 19,614
Pretax profits	$ 3,611	$ 3,236	$ 10,424	$ 9,625