Quarterly report pursuant to Section 13 or 15(d)

Information by Business Segment (Details 4)

v3.10.0.1
Information by Business Segment (Details 4) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Reconciliation of segment assets to total assets      
Assets $ 3,650,366 $ 3,595,205 $ 3,576,841
Segment assets      
Reconciliation of segment assets to total assets      
Assets 3,074,986   3,014,281
Non-operating property assets      
Reconciliation of segment assets to total assets      
Assets 420,109   413,255
Other assets      
Reconciliation of segment assets to total assets      
Assets $ 155,271   $ 149,305