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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

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