Quarterly report pursuant to Section 13 or 15(d)

Information by Business Segment (Details 4)

v3.7.0.1
Information by Business Segment (Details 4) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Reconciliation of segment assets to total assets      
Assets $ 3,574,887 $ 3,780,885 $ 3,841,692
Segment assets      
Reconciliation of segment assets to total assets      
Assets 2,975,661   3,289,117
Non-operating property assets      
Reconciliation of segment assets to total assets      
Assets 452,824   413,597
Other assets      
Reconciliation of segment assets to total assets      
Assets $ 146,402   $ 138,978