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Equity (Tables)
 6 Months Ended
Jun. 30, 2013
Targeted or Tracking Stock, Stock [Line Items]  
Schedule of Common Stock Outstanding Roll Forward [Table Text Block]
The following table summarizes issuances of common stock sold through the ATM program since inception through June 30, 2013:


Number of Shares
Settled

Gross
Proceeds

Net
Proceeds

Weighted-average
Sales Price
2013:








First quarter

1,889,105


$
44,459


$
43,904


$
23.53

Second quarter

6,530,193


167,034


165,692


25.58

Total

8,419,298


$
211,493


$
209,596


$
25.12