Fair Value Measurements (Schedule Of Non-Recurring Losses Recognized Using Fair Value Measurements And The Carrying Value Of Any Assets And Liabilities Measured Using Fair Value Estimates) (Details) (Nonrecurring, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets
Assets, Carrying Value	$ 71,946	$ 7,579	$ 6,354
Assets, Non-Recurring Losses	0	145	1,751
Liabilities, Carrying Value	0	0	0
Liabilities, Non-Recurring Losses	0	0	50
Vacant Owned Facilities
Assets
Assets, Carrying Value	3,863	3,197	5,009
Assets, Non-Recurring Losses	0	145	523
Other intangible assets
Assets
Assets, Carrying Value	0	0	0
Assets, Non-Recurring Losses	0	0	1,228
Net Assets Of Acquired Businesses
Assets
Assets, Carrying Value	68,083	4,382	1,345
Assets, Non-Recurring Losses	0	0	0
Vacant leased facilities
Assets
Liabilities, Carrying Value	0	0	0
Liabilities, Non-Recurring Losses	$ 0	$ 0	$ 50