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Information by Business Segment (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reconciliation of segment assets to total assets      
Assets $ 3,629,952 $ 3,653,759  
Segment assets
     
Reconciliation of segment assets to total assets      
Assets 2,905,630 2,945,930 3,039,440
Non-operating property assets
     
Reconciliation of segment assets to total assets      
Assets 517,564 570,402  
Other
     
Reconciliation of segment assets to total assets      
Assets $ 206,758 $ 137,427