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Related Party Transactions - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Former Chairman and CEO Severance
Mar. 31, 2014
Employee Severance
Gulf Properties
Mar. 31, 2013
Executive Severance
Related Party Transaction      
Severance, liability $ 4.3    
Employee termination benefits expense   $ 8.1 $ 10.4