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Summary of Significant Accounting Policies (Details 2)
$ in Thousands
 12 Months Ended
Dec. 31, 2014
USD ($)
item
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Goodwill and Other Intangible Assets      
Goodwill $ 874,184 $ 951,953 $ 1,380,689
Other intangible assets, net $ 419,453 $ 234,258  
Number of issues that arise with respect to assets that require significant management estimates and judgment | item 2    
Land Improvements      
Estimated useful lives of property and equipment      
Useful lives 15 years    
Building and Building Improvements | Minimum      
Estimated useful lives of property and equipment      
Useful lives 5 years    
Building and Building Improvements | Maximum      
Estimated useful lives of property and equipment      
Useful lives 31 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