Fair Value Measurements (Narrative) (Details) (USD $)	6 Months Ended			3 Months Ended	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Jun. 30, 2013 Vacant Owned Facilities property	Jun. 30, 2014 Vacant Owned Facilities property	Jun. 30, 2013 Vacant Owned Facilities property
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Percentage of deferred compensation invested in life insurance contracts	65.00%
Number of years long-term sales growth forecasted over	3 years
Average long-term sales growth forecast, over next 4 years, percent per year	20.00%
Number Of Vacant Owned Facilities					3	4
Number Of Vacant Owned Facilities Sold					1
Number Of Properties Classified As Fixed Assets				2	2	2
Number Of Vacant Facilities Owned Not Exceeding Carrying Value				1		1
Estimated combined fair value				$ 4,000,000	$ 3,100,000	$ 4,000,000
Combined carrying value	126,523,000	125,982,000	117,419,000	3,200,000	2,700,000	3,200,000
Tangible Asset Impairment Charges						$ 100,000
Number Of Vacant Owned Facilities Reopened				1