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