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Equity (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Jun. 30, 2013
Equity [Abstract]          
Issuance Costs     $ 3,000,000    
Stock Offering       11,100,000  
Share Price         $ 29.50
Common Stock, Discount on Shares         0.96
Equity Forward Sale Agreement, Settlement Threshold 10,400,000        
Equity Forward Sale Agreement future settlement amount 278,000,000        
Option Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value 56,000,000 56,000,000      
Net share settlement 1,742,421 1,742,421      
Proceeds from Issuance of Common Stock   $ 0 $ 67,000,000