XML 96 R78.htm IDEA: XBRL DOCUMENT v3.7.0.1
Subsequent events (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Feb. 08, 2017
$ / shares
Dec. 31, 2016
$ / shares
Sep. 30, 2016
$ / shares
Jun. 30, 2016
$ / shares
Mar. 31, 2016
$ / shares
Dec. 31, 2015
$ / shares
Sep. 30, 2015
$ / shares
Jun. 30, 2015
$ / shares
Mar. 31, 2015
$ / shares
Dec. 31, 2014
$ / shares
Sep. 30, 2014
$ / shares
Jun. 30, 2014
$ / shares
Mar. 31, 2014
$ / shares
Feb. 21, 2017
USD ($)
ft²
story
$ / squarefeet
Subsequent Event [Line Items]                            
Dividends declared (in dollars per share)   $ 0.21 $ 0.21 $ 0.21 $ 0.21 $ 0.21 $ 0.21 $ 0.21 $ 0.21 $ 0.21 $ 0.2 $ 0.2 $ 0.2  
Subsequent Event [Member]                            
Subsequent Event [Line Items]                            
Dividends declared (in dollars per share) $ 0.21                          
Subsequent Event [Member] | Sale of Two Independence Square [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]                            
Subsequent Event [Line Items]                            
Number of square feet of office building | ft²                           600,000
Number of stories of office building | story                           9
Percentage leased                           100.00%
Amount of sales price | $                           $ 359.6
Sales price per square foot | $ / squarefeet                           593