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
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Reconciliation of segment assets to total assets      
Assets $ 3,559,772 $ 3,780,885 $ 3,634,194
Segment assets      
Reconciliation of segment assets to total assets      
Assets 2,997,212   3,027,125
Non-operating property assets      
Reconciliation of segment assets to total assets      
Assets 413,255   421,364
Other assets      
Reconciliation of segment assets to total assets      
Assets $ 149,305   $ 185,705