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Share-based Compensation and Non-Qualified Deferred Compensation Plan (NQDC diversified share awards rollforward) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Share-Based Compensation and Non-Qualified Deferred Compensation [Abstract]    
Balance at December 31, 2014 $ 68,134  
Change in classification 7,924 $ 4,916
Change in redemption value (184) $ 12,936
Diversification of share awards (3,558)  
Balance at September 30, 2015 $ 72,316