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Capital - Distributions (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 30, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Abstract]                        
Dividends declared and paid on operating partnership units (in dollars per share) $ 0.085 $ 0.085 $ 0.085 $ 0.085 $ 0.085 $ 0.085 $ 0.085 $ 0.085 $ 0.0795      
Pro-ration of full quarter distribution of dividend                 $ 0.085      
Distributions paid to OP unit holders                   $ 91.9 $ 87.7 $ 19.5