XML 25 R55.htm IDEA: XBRL DOCUMENT v2.4.0.8
Equity and Capital (Details) (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Mar. 01, 2013
Targeted or Tracking Stock, Stock [Line Items]      
Common stock offering, maximum aggregate price     $ 300,000,000
Commission to sales agent, maximum (percent)     2.00%
Number of shares settled 243,648 8,635,715  
Gross proceeds 639,000 209,531,000  
Net proceeds 131,000 209,510,000  
Common stock offering, maximum aggregate price still available 88,507,000    
At The Market Stock Sales [Member]
      
Targeted or Tracking Stock, Stock [Line Items]      
Number of shares settled   8,419,298.000  
Gross proceeds   211,493,000  
Net proceeds   $ 209,596,000  
Weighted-average sales price (in dollars per share)   $ 25.12