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Equity (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Equity [Abstract]      
Issuance Costs   $ 2,000,000  
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 281,000,000    
Option Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value $ 79,000,000    
Net share settlement 2,287,000