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Information by Business Segment (Details 3) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015
--- | --- | --- | ---
Reconciliation of segment assets to total assets |  |  |
Assets | $ 3,841,692 | $ 3,909,312 | $ 3,904,059
Segment assets |  |  |
Reconciliation of segment assets to total assets |  |  |
Assets | 3,289,117 |  | 3,218,657
Non-operating property assets |  |  |
Reconciliation of segment assets to total assets |  |  |
Assets | 413,597 |  | 527,742
Other assets |  |  |
Reconciliation of segment assets to total assets |  |  |
Assets | $ 138,978 |  | $ 157,660

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