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Share-based Compensation and Non-Qualified Deferred Compensation Plan (NQDC diversified share awards rollforward) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Share-Based Compensation and Non-Qualified Deferred Compensation [Abstract]    
Balance at December 31, 2014 $ 68,134  
Change in classification 4,678 $ (2,156)
Change in redemption value (1) $ 14,819
Diversification of share awards (3,020)  
Balance at June 30, 2015 $ 69,791