Summary Of Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Accounting Policies [Line Items]
Number of business segments	3
Total cash deposits in excess of insured limits with federal financial institutions	$ 4.8
Land Improvements [Member]
Accounting Policies [Line Items]
Property plant and equipment, asset service lives, minimum (in years)	15
Property plant and equipment, asset service lives, maximum (in years)	30
Buildings [Member]
Accounting Policies [Line Items]
Property plant and equipment, asset service lives, minimum (in years)	15
Property plant and equipment, asset service lives, maximum (in years)	30
Furniture [Member]
Accounting Policies [Line Items]
Property plant and equipment, asset service lives, minimum (in years)	5
Property plant and equipment, asset service lives, maximum (in years)	15
Machinery And Equipment [Member]
Accounting Policies [Line Items]
Property plant and equipment, asset service lives, minimum (in years)	5
Property plant and equipment, asset service lives, maximum (in years)	15
Customer Capital [Member]
Accounting Policies [Line Items]
Property plant and equipment, asset service lives, minimum (in years)	5
Property plant and equipment, asset service lives, maximum (in years)	10
Vehicles [Member]
Accounting Policies [Line Items]
Property plant and equipment, asset service life, average (in years)	5
Computer Hardware And Software [Member]
Accounting Policies [Line Items]
Property plant and equipment, asset service lives, minimum (in years)	5
Property plant and equipment, asset service lives, maximum (in years)	10
Workforce Subject To Collective Bargaining Arrangements [Member]
Accounting Policies [Line Items]
Percentage of labor force covered	27.00%
Workforce Subject To Collective Bargaining Arrangements Expire 2013 [Member]
Accounting Policies [Line Items]
Percentage of labor force covered	27.00%
Expiry date of labor force covered	2013
Workforce Subject To Collective Bargaining Arrangements Expire 2014 [Member]
Accounting Policies [Line Items]
Percentage of labor force covered	27.00%
Expiry date of labor force covered	2014
Maximum [Member]
Accounting Policies [Line Items]
Percentage of credit concentration risk on total annual revenues	10.00%