Independent Contractor Operations (Schedule Of Independent Contractors) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Independent Contractor Operations [Abstract]
Revenues	$ 6,809	$ 6,528	$ 13,491	$ 13,039
Pretax profits	$ 3,732	$ 3,402	$ 6,813	$ 6,389