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	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets
Assets, carrying value	$ 31,264	$ 70,032	$ 7,579
Assets, non-recurring losses	0	0	145
Vacant Owned Facilities
Assets
Assets, carrying value	2,537	3,863	3,197
Assets, non-recurring losses	0	0	145
Other Intangible Assets
Assets
Assets, carrying value	0	0	0
Assets, non-recurring losses	0	0	0
Net Assets of Acquired Businesses
Assets
Assets, carrying value	28,727	66,169	4,382
Assets, non-recurring losses	$ 0	$ 0	$ 0