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Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2015
Dec. 10, 2015
Oct. 28, 2015
Oct. 27, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Class of Stock [Line Items]                  
Common Stock, Authorized         450,000,000   450,000,000   450,000,000
Common Stock, Par Value         $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01
Common Stock, Issued         137,506,040   137,506,040   136,624,157
Common Stock, Outstanding         137,506,040   137,506,040   136,624,157
Preferred Stock, Shares Authorized         50,000,000   50,000,000    
Preferred Stock, Par or Stated Value Per Share         $ 0.01   $ 0.01    
Preferred Stock, Shares Issued         0   0    
Preferred Stock, Shares Outstanding         0   0    
Issuance of stock for purchases of property and equipment (shares)             374,352    
Issuance of stock for purchase of property and equipment             $ 10.5    
Dividends declared per common share (in dollars per share)         $ 0.34 $ 0.37 $ 1.08 $ 0.74  
Subsequent Event                  
Class of Stock [Line Items]                  
Issuance of stock for purchases of property and equipment (shares)       68,570          
Dividends Payable, Date Declared     Oct. 28, 2015            
Dividends declared per common share (in dollars per share)     $ 0.34            
Dividends Payable, Date to be Paid Dec. 31, 2015                
Dividends Payable, Date of Record   Dec. 10, 2015              
Additional Paid-In Capital                  
Class of Stock [Line Items]                  
Issuance of stock for purchase of property and equipment             $ 10.5    
Additional Paid-In Capital | Subsequent Event                  
Class of Stock [Line Items]                  
Issuance of stock for purchase of property and equipment       $ 1.6