Distributions (Table)

12 Months Ended

Dec. 31, 2012

Stockholders' Equity

Schedule of Dividends [Table Text Block]

Declaration Date	Payment Date	Record Date	Distribution per share	Aggregate Payment Amount (in millions)
March 22, 2012	April 25, 2012	April 11, 2012	$ 0.21	$ 82.9
June 20, 2012	July 18, 2012	July 2, 2012	$ 0.22	$ 86.9
September 19, 2012	October 15, 2012	October 1, 2012	$ 0.23	$ 90.9
December 6, 2012	December 31, 2012	December 17, 2012	$ 0.24	$ 94.8