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Summary of Significant Accounting Policies (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
issue
Dec. 31, 2012
Dec. 31, 2011
Goodwill and Other Intangible Assets      
Goodwill $ 492,398 $ 1,380,689 $ 1,180,359
Other intangible assets $ 359,648 $ 706,477  
Goodwill as a percentage of total assets 22.50%    
Other intangible assets as a percentage of total assets 16.50%    
Number of issues that arise with respect to assets that require significant management estimates and judgment 2    
Land improvements | Minimum
      
Estimated useful lives of property and equipment      
Useful lives 5 years    
Land improvements | Maximum
      
Estimated useful lives of property and equipment      
Useful lives 15 years    
Building and improvements | Minimum
      
Estimated useful lives of property and equipment      
Useful lives 5 years    
Building and improvements | Maximum
      
Estimated useful lives of property and equipment      
Useful lives 40 years    
Furniture, fixtures and equipment | Minimum
      
Estimated useful lives of property and equipment      
Useful lives 3 years    
Furniture, fixtures and equipment | Maximum
      
Estimated useful lives of property and equipment      
Useful lives 31 years