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Investments in and Advances to Nonconsolidated Affiliates - Textual (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
facilities
Dec. 31, 2011
Investments In and Advances to Nonconsolidated Affiliates (Textual) [Abstract]    
Investments In and Advances To Nonconsolidated Affiliates $ 29.5 $ 29.0
Number of Partially-Owned Subsidiaries, Nonconsolidated 13  
Number of General or Limited Partnerships, Limited Liability Companies, or Joint Ventures, Nonconsolidated 9  
Minimum [Member]
   
Investments In and Advances to Nonconsolidated Affiliates (Textual) [Abstract]    
Nonconsolidated Affiliates, Ownership Percentage 1.00%  
Maximum [Member]
   
Investments In and Advances to Nonconsolidated Affiliates (Textual) [Abstract]    
Nonconsolidated Affiliates, Ownership Percentage 51.00%