Quarterly report pursuant to Section 13 or 15(d)

Information by Business Segment (Details 4)

v3.8.0.1
Information by Business Segment (Details 4) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Reconciliation of segment assets to total assets      
Assets $ 3,596,238 $ 3,595,205 $ 3,757,131
Segment assets      
Reconciliation of segment assets to total assets      
Assets 3,025,966   2,970,117
Non-operating property assets      
Reconciliation of segment assets to total assets      
Assets 425,951   429,690
Other assets      
Reconciliation of segment assets to total assets      
Assets $ 144,321   $ 357,324