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Equity and Capital (Details) (USD $)
 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Mar. 01, 2013
Jun. 30, 2013
At The Market Stock Sales [Member]
Jun. 30, 2013
At The Market Stock Sales [Member]
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 241,188 8,632,742   6,530,193 8,419,298.000
Gross proceeds 590,000     167,034,000 211,493,000
Net proceeds 82,000 209,506,000   165,692,000 209,596,000
Weighted-average sales price (in dollars per share)       $ 25.58 $ 25.12
Common stock offering, maximum aggregate price still available $ 88,507,000