Fair Value Measurements (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 property	Dec. 31, 2013 property	Dec. 31, 2012 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	30.00%
Combined carrying value	$ 146,788,000	$ 125,982,000
Vacant Owned Facilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Number of vacant owned properties	4	6	8
Number properties classified as fixed assets	3	3	4
Number of vacant facilities owned, not exceeding carrying value		2	5
Estimated combined fair value	4,200,000		6,600,000
Combined carrying value	3,900,000
Tangible Asset Impairment Charges		100,000	500,000
Vacant Owned Facilities Classified In Fixed Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Estimated combined fair value		3,600,000
Combined carrying value		3,200,000	5,000,000
Other intangible assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Carrying value of intangible assets			1,200,000
Non-cash impairment charge			1,200,000
Cost of Sales | Other intangible assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Non-cash impairment charge			$ 1,000,000