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Commitments and Contingencies (Details 3)
$ in Millions
 12 Months Ended
Feb. 25, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2008
USD ($)
Dec. 31, 2007
Oct. 06, 2015
subsidiary
Aug. 29, 2015
subsidiary
Mustard Lawsuit                  
Loss Contingencies [Line Items]                  
Number of subsidiaries | subsidiary                 2
Sloan Lawsuit                  
Loss Contingencies [Line Items]                  
Number of subsidiaries | subsidiary               2  
Litigation | CRNF                  
Loss Contingencies [Line Items]                  
Property tax abatement period             10 years    
Increase in property tax expenses | $   $ 11.3 $ 11.4 $ 11.7 $ 10.7 $ 10.7      
Decrease in property tax expenses | $ $ 10.7                
Tax exemption period 10 years